Computer Technical Terms: The Ultimate A–Z Glossary (618+ Terms)
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The most comprehensive computer and technology glossary available – everyday basics, Windows and Mac, mobile security, scams, AI tools, cloud computing, hardware, data recovery, networking, Australian digital services, and much more. All in plain English.
Computer Technical Terms
The most common technical term for a computer technician is a “propeller-head” – maybe because when they speak, they make your head feel like it’s spinning with acronyms you’ve never heard of! When it comes to talking in “propeller-head” jargon and complex terms, no industry is worse than IT – even its very name is an acronym! Here are over 618 of the most important computer and technology terms used today, from classic hardware basics right through to AI, cloud computing, cybersecurity, satellite internet, and the latest in emerging technology. Our goal: to translate the jargon into plain English, once and for all.
Check out our related post on common technical terms business entrepreneurs should know – a handy guide for business leaders. Need to translate technical talk into plain English? We’ve got that covered too.
Jump To A Section
Numbers: 4K / 8K Resolution • 5G • 6G • 3D Printing
A: ABN / ACN / TFN • Accessibility Features • Accounting Software • ACSC • Activation Lock • Active Directory / Azure AD / Entra ID • Ad Blocker • ADSL / ADSL 2+ • Agentic AI / AI Agents • Agile / Scrum / Kanban • AI Chatbot • AI Coding Assistants • AI Computing / AI PC • AI in Healthcare / Medical AI • AI Image Generation • AI Safety / AI Alignment • AI Transcription / Voice-to-Text • Air Gap • AirDrop / Nearby Share Security • Algorithm • All-in-One Printer / Multifunction Device • Android Security Features • Anycast / Multicast / Broadcast • API • REST API / GraphQL • APN • App / Application / Software • Apple Configurator / MDM for Mac • Apple ID / iCloud Account Security • Apple Silicon • Augmented Reality • Artificial Intelligence • ASCII / Unicode • Aspect Ratio • ATO • Attachment • Autonomous Vehicles / Self-Driving Technology
B: Backup vs Data Recovery • Bad Sectors • Bandwidth • Barcode Scanner • Battery / Laptop Battery Health • UPS Sizing / Runtime Calculator • BCD • BGP • Binary / Hexadecimal / Number Systems • Biometrics • BIOS / UEFI • BIOS / UEFI Update • Bit • BitLocker • Bitrate • Blockchain • Blu-ray • Bluetooth • BNPL • Bookmark / Favourite • Boot / Startup / Reboot • Bootable USB / Recovery Drive • Broadband • Browser / Web Browser • Browser • Browser Fingerprinting • BSOD • Bug / Debugging • Business Continuity Planning • BEC • Business Intelligence • Byte
C: Cable Internet • Cache / Browser Cache • CAPTCHA • CD Burner • CDN • Centrelink Online / Services Australia Digital • Certificate Authority • CGNAT • Chain of Custody • ChatGPT for Business / AI Writing Tools • Checksum / Hash Function • Chipset • CI/CD • Cleanroom • CLI / Terminal / Command Line • Click of Death • Clipboard • Cloud Gaming / Game Streaming • Cloud Backup • Cloud Computing • OneDrive / iCloud / Google Drive • CMS • Codec • Monitor Calibration / Colour Management • Colour Space / Colour Gamut • File Compression • Computer • Blue Light / Digital Eye Strain • Computer Insurance / Accidental Damage Cover • Computer Maintenance Schedule • Computer Won’t Turn On / Won’t Start • Gaming Console • Containerisation / Docker • Context Menu / Right-Click Menu • CGM • Control Panel / Settings • Cookie • Computer Cooling Types • Microsoft Copilot • Copy, Cut, and Paste • Corrupt File / File Corruption • CPU • Crash / Freeze / Hang • CRM • CRT • Cryptocurrency Wallet • Cryptocurrency • Cursor / Mouse Pointer • CVE • Cybersecurity
D: DAC / Audio Interface • Dark Mode • Dark Web • Data Breach • Data Broker • Data Carving • Data Loss • Data Recovery • Data Sovereignty / Data Residency • Database / SQL / NoSQL • DAW • DDoS Attack • Deep Learning • Deepfake • Default Settings • Degausser / Data Destruction • Dependency / Package Manager • Desktop • Development Environment / Local Dev • DevOps • DHCP • Dial-up Internet • Diffusion Model • Digital Footprint • Digital ID • Digital Literacy • Digital Photography Basics • Digital Signature / Code Signing • Digital Transformation • Digital Twin • Digital Wallet / Mobile Payment • Disaster Recovery Plan • Discord / Gaming Platform Security • Disk Clone / Drive Cloning • Disk Image / Forensic Image • Display Connector Types • DisplayPort • DNS • DNS over HTTPS • Docking Station / Port Replicator • Dolby Atmos / Spatial Audio • Domain Name / URL • Dongle • Donor Drive • Double-Click vs Single Click • Download • DPI • Drag and Drop • Drawing Tablet / Graphics Tablet / Stylus Pen • Driver • DRM • DSLR vs Mirrorless vs Smartphone Camera
E: E-Reader / Kindle • E-Waste • ECC RAM • eCommerce / Online Store • Edge AI / On-Device AI • Edge Computing • eInvoicing • Email • Email Encryption • Email Spoofing • Vector Embeddings • Encryption / End-to-End Encryption • Ergonomic Accessories • ERP • eSIM • esports • Ethernet • Ethernet Cable Types • External Hard Drive / External SSD
F: Factory Reset • Fake Invoice / Business Email Compromise • Fibre Optic Cable • File Extension • File and Folder • File Permissions • File System • FileVault • Find My • Finder / Spotlight Search • Fine-Tuning • Firewall • Firmware • Router Security Best Practices • Flash Storage / NAND Flash • Floppy Disk / Obsolete Storage Media • Forensic Imaging • PC Form Factor • FPS • Fragmentation / Defragmentation • Framework vs Library • Freeze • FTP / SFTP / SCP
G: Game Controller / Gamepad / Joystick • Gaming Peripherals • GDPR / International Privacy Law • Generative AI • Geofencing • Gigabyte • Git / Version Control • Google Business Profile • Google Play Protect • Google Workspace • GPS • GPU • Green IT / Sustainable Computing • Group Policy • GST / BAS • Guest Network
H: Hallucination • Hard Drive • Hardware vs Software • HDMI • HDMI ARC / eARC • HDR • Head Crash • Headphones / Headset • Help Desk / IT Ticketing System • Hex Editor • Zigbee / Z-Wave • Homepage • Hotspot / Mobile Hotspot • HTML / CSS / JavaScript • HTTPS / SSL / TLS • Hyperlink / Link • Hypervisor / Virtualisation
I: IAM • iCloud • Icon • IDE • Identity Theft • IDS / IPS • IMAP / POP3 / SMTP • IMEI Number • iMessage / RCS / Messaging Security • Incident Response • Infrastructure as Code • Internet Speed Test • Investment Scam / Crypto Scam • IoT • IP Addressing • IP Camera / Security Camera • iPhone Security Features • IPTV • IPv6 • ISP • Secure Data Erasure and IT Disposal • IT Asset Management
J: JSON / XML
K: Keyboard • Keyboard Shortcuts • Keylogger • Knowledge Management / Wiki • KVM Switch
L: LAN • Laptop Buying Guide • Laptop Care and Battery Longevity • Laptop Screen Repair • Laptop Stand • Latency / Ping • LCD • Legacy Technology / End of Life • Li-Fi • Linux • Liquid Cooling / Water Cooling • Large Language Model • Load Balancer • Loading / Buffering • Local AI / On-Premises AI • Location Tracking on Mobile • Log In / Log Out / Password • Logic Board / Motherboard Repair • Logical Failure vs Physical Failure • Lossless vs Lossy Compression • Low-Code / No-Code Development
M: MAC Address • Machine Learning • macOS Versions • macOS Security Features • macOS Terminal / zsh • Malvertising • Malware • Managed IT Services / MSP • Managed Switch vs Unmanaged Switch • Matter / Thread • MBR / GPT • MDM • BYOD • Mechanical Keyboard Switches • Media Server / Plex / Home NAS • Medicare Online Services • Mesh Network / Wi-Fi Mesh • Metadata • Metaverse • Multi-Factor Authentication • Microphone • Microservices Architecture • Microsoft 365 Explained • Mini-LED / Micro-LED • Man-in-the-Middle Attack • Mobile Banking Security • Mobile Data / 4G LTE • Mobile Malware Types • Mobile VPN Usage • Model Size / Parameters • Modem • Monitor • Monitor Arm / Monitor Stand • Moore’s Law • Motherboard • Mouse • Mouse DPI / Sensor Types • Multi-Core Processor • Multimodal AI • My Health Record • My Aged Care • myGov / ATO Online Services
N: NAS • NAS Recovery • NAT • National Broadband Network • NBN Speed Tiers Explained • NDIS & Assistive Technology • Network • Network Congestion / Internet Throttling • Network Monitoring / SNMP • Network Switch • Network Topology • Neural Network • NFC • NFT • Notification • Notion / Knowledge Management Apps • NTP • Number Portability / Phone Number Porting • Numeric Keypad / Numpad • NVMe • NVR / DVR
O: Object Storage • OBS / Screen Recording • OCR • OLED • Online Learning / eLearning Platforms • Common Online Scam Types in Australia • OOP • OpenAPI / Swagger • Open Banking / Consumer Data Right • Open Source Software • OS • OTA Update • Overclocking • Overwrite / Secure Erase
P: Packet / Packet Switching • Parental Controls • Parental Monitoring Apps vs Stalkerware • Partition • Passphrase • Password Hygiene / Passphrases • Password Manager • Password Spraying / Credential Stuffing • Patch Management • PayID / NPP • PBX • PCB • PCIe • PDF • Advanced Mobile Spyware • Penetration Testing / Ethical Hacking • Peripheral • Phishing • SMS Phishing • Phone Security Checklist • Mobile Phone Backup • Signs Your Phone Has Been Hacked • What To Do If Your Phone Is Stolen • Photonic Computing / Light-Based Computing • Physical Failure • Ping / Traceroute • Pixel • Plugin / Extension / Add-on • Podcast / RSS • Power over Ethernet • Pop-up / Pop-up Window • Port / Port Forwarding • DisplayPort Multi-Stream Transport / Daisy Chaining • POS • EFTPOS / Payment Terminal • Power Cycle / Hard Restart • PSU Rails / Power Connectors • Powerline Adapter / MoCA • Print Spooler / Print Queue • Print to PDF / PDF Tools • Printer • Printer Troubleshooting • Privacy Act / Australian Privacy Principles • Private Browsing / Incognito Mode • Productivity Suite / Office Software • Programming Language • Project Management Software • Projector • Prompt Engineering • Protocol • Proxy Server • PSU
Q: Quality of Service • QR Code • Quantum Computing
R: RAG • RAID • RAID Recovery • Rainbow Table / Password Hashing • RAM • Ransomware • Ransomware Recovery • RAW Image Format • Ray Tracing • RDP • Recovery Mode • Recycle Bin / Trash • Refresh Rate • Refurbished / Second-Hand Computers • Regular Expression • Remote Desktop • Remote Work Technology • Responsible AI / AI Ethics • Restart vs Shut Down vs Sleep vs Hibernate • Ripping • RMM • Robot Vacuum / Smart Cleaning Appliances • Romance Scam / Catfishing • Rooting / Jailbreaking • Router • RPO and RTO
S: SaaS / PaaS / IaaS • SaaS Security / Shadow IT • Safe Mode • Satellite Internet • Scamwatch / Reporting Scams in Australia • Scanner • Screen Lock Types and Security Levels • Screen Reader / Text-to-Speech • Screen Resolution Guide • Screen Time / Digital Wellbeing • Screenshot / Screen Capture • Scroll / Scrollbar • SD Card / Memory Card • SD-WAN • Search Engine • SEO • Server • Serverless Computing • Shadow Copy / Previous Versions / Volume Shadow Copy Se • SharePoint • Shortcut • SIEM • SIM Card • SIM Swapping Attack • SSO • SLA • Slack • Sleep Mode • Slow Computer • Smart Home Appliances • SMART Data • Smart Video Doorbell • Smart Home / Home Automation • Smart Lock / Smart Home Security • Smart Meter / Smart Grid • Smart Plug / Smart Power Strip • Smart TV • Smartwatch Buying Guide • SMB / File Sharing Protocols • SOC • Social Engineering • Social Media Account Security • Social Media Algorithm • Software Update • Spam • Spam Filter / Email Security Gateway • Speakers / Computer Speakers • SPF / DKIM / DMARC • Mac Privacy Controls • Spyware / Adware • SSD • SSH • Stalkerware / Spyware • Starlink • Steam / PC Gaming Platforms • Storage Interfaces • Streaming Audio and Video • Streaming Stick / Streaming Device • Stylus / Digital Pen • Subnet / Subnetting • Supply Chain Attack • Surge Protector / Power Board • Sync / Cloud Sync • System Restore
T: Tablet vs Laptop • Tape Backup / LTO Tape • Task Manager • Task Scheduler / Startup Programs • Taskbar • Microsoft Teams • Tech Support Scam • Telehealth / Digital Health • Thermal Imaging • Thermal Paste / Thermal Interface Material • Thermal Throttling • Thin Client • Threat Intelligence • Thunderbolt / USB-C • Time Machine • Tokens / Context Window • Toner vs Ink • Touchpad / Trackpad • Touchscreen • TPM • Tracking Pixel • Transformer Architecture • TRIM • Trojan Horse • Turing Test • Passkey • Authenticator App • MFA Backup Codes / Account Recovery • Google Account Security / Android Account Security
U: Undelete / File Recovery Software • Undo and Redo • Upload • UPS • UPS • UPS Types • USB • USB Flash Drive / Thumb Drive / Memory Stick • USB Hub • User Account
V: Variable, Function, and Loop • VESA Mount • Video Conferencing • Video Editing Software • VDI • Virtual Memory / Page File • Virtualisation • Virus • Virus Warning Pop-ups • VLAN • Voice Assistant / Smart Speaker • VoIP • VoIP Codecs / Call Quality • Von Neumann Architecture • VPN • VPN Types • VPN Leak / DNS Leak • VPN Protocols • VR Headset / Spatial Computing Device
W: WAF • Wake-on-LAN • WAN • Water Damage Repair • Wear Leveling • Wearable Technology • Web Analytics • Web App / Progressive Web App • Web Hosting • Webcam • Webhook / API Automation • Website Builder • WhatsApp / Signal / Secure Messaging Security • Wi-Fi 6 / Wi-Fi 6E / Wi-Fi 7 • Wi-Fi Password / Network Key • Wi-Fi Troubleshooting Guide • Window • Windows Versions Explained • Upgrading to Windows 11 • Windows Activation / Licence • Windows Backup / File History • Windows Defender / Microsoft Defender Antivirus • Windows Event Viewer / Event Logs • Windows Firewall / Windows Security • Windows Hello • Windows Hello / Windows PIN • Windows Registry • Windows Sandbox / Hyper-V • Windows Troubleshooters / Diagnostic Tools • Windows Updates / Software Updates • Wireless Charging • Wireless Network • WPA3 / Wi-Fi Security Standards • Worm • Write Blocker • WSL
X: XR
Z: Zero-Day Vulnerability / Zero-Day Exploit • Zero Trust Security
4K / 8K Resolution
4K (Ultra HD / UHD) refers to a display resolution of approximately 3,840 × 2,160 pixels – four times the pixel count of 1080p Full HD. This results in sharper, more detailed images, particularly noticeable on screens larger than 32 inches. 8K doubles this again to 7,680 × 4,320 pixels – currently used mainly in high-end televisions with limited native 8K content available. 4K is now mainstream: most new TVs, monitors, smartphones, and content from Netflix, YouTube, Disney+, and Apple TV+ support 4K. For computer monitors, 4K at 27″ or 32″ delivers exceptional sharpness for creative work. A pixel is a single dot of colour on a display; resolution describes how many pixels make up the entire image. See also: Blu-ray, Monitor, HDMI, Streaming, Pixel.
5G
5G is the fifth generation of mobile network technology, offering dramatically faster data speeds, lower latency, and the ability to connect far more devices simultaneously compared to 4G. While 4G LTE typically delivers speeds of 20–100 Mbps, 5G can reach speeds of 1–10 Gbps in ideal conditions. In Australia, 5G networks are now widely deployed in major cities by Telstra, Optus, and Vodafone. 5G operates across three frequency bands: low-band (wide coverage, slower speeds), mid-band (the most common balance of speed and range), and mmWave high-band (very fast but short range, currently deployed mainly in CBDs and high-density venues). 5G is particularly important for powering the Internet of Things (IoT), smart cities, autonomous vehicles, and industrial automation. See also: IoT, Latency, Bandwidth.
6G
6G is the anticipated sixth generation of mobile network technology, expected to begin commercial deployment around 2030. While 5G is still being rolled out globally, research and standardisation work for 6G is already underway at universities and government bodies worldwide. Expected 6G capabilities include: peak speeds of 1 Tbps (1,000 Gbps – 100x faster than 5G’s theoretical maximum); sub-millisecond latency; near-universal coverage including satellite integration; native AI processing at the network edge; sub-terahertz frequency bands; and support for holographic communications, advanced XR (Extended Reality), and massive IoT deployments. Countries including South Korea, China, Japan, and the US are all investing heavily in 6G research. Australian universities are active in 6G research through programs like the SmartSat CRC. See also: 5G, Latency, IoT, Starlink.
3D Printing
3D printing (also called additive manufacturing) is a process of creating three-dimensional objects by building them up layer by layer from digital designs. Consumer and prosumer 3D printing technologies: FDM (Fused Deposition Modelling) – the most common type; melts thermoplastic filament (PLA, PETG, ABS) and deposits it layer by layer; affordable ($200–$1,000 for consumer models); Bambu Lab, Creality, Prusa are popular brands. MSLA/SLA (resin printing) – uses UV light to cure liquid resin; much higher detail resolution; suitable for miniatures, jewellery, dental models; requires careful resin handling (toxic until cured). Applications: replacement parts (buttons, brackets, mounts); custom cases and enclosures; prototyping; hobbyist models and figurines; educational tools; prosthetics and medical devices. Files are created in CAD software (Fusion 360, TinkerCAD for beginners) or downloaded from communities like Thingiverse and Printables. 3D printing has become accessible to home users and small businesses, enabling rapid physical prototyping without manufacturing minimums. See also: GPU, Computer.
ABN / ACN / TFN (Australian Business Identifiers)
Key Australian business and tax identification numbers: TFN (Tax File Number) – a unique identifier assigned to individuals and organisations by the ATO for tax purposes. Treat your TFN like a password – never share it unnecessarily; it’s required for employment, bank accounts, and tax lodgements. ABN (Australian Business Number) – an 11-digit public identifier for businesses registered with the Australian Business Register (ABR). Required for invoicing, registering for GST, and using various government services. Registered businesses can be verified via abn.business.gov.au. ACN (Australian Company Number) – a 9-digit number assigned by ASIC (Australian Securities and Investments Commission) to every company registered in Australia. Companies must display their ACN on public documents alongside their ABN. See also: myGov, ATO Digital Services, Digital ID.
Accessibility Features (Digital Accessibility)
Digital accessibility refers to the design of technology products and content so that they can be used by people with disabilities, including visual, motor, hearing, and cognitive impairments. Modern operating systems include extensive built-in accessibility features: Screen readers (VoiceOver on Apple, Narrator on Windows, TalkBack on Android) read text aloud for blind users; Magnification enlarges screen content; High contrast mode improves visibility for low-vision users; Voice Control allows full computer control by voice without a keyboard or mouse; Switch Control enables control via a single switch button for motor-impaired users; Closed captions on video; Keyboard navigation for those who cannot use a mouse; and colour blind modes. The WCAG (Web Content Accessibility Guidelines) standard defines how websites should be built to ensure accessibility. See also: Voice Assistant, Touchscreen.
Accounting Software (Xero / MYOB / QuickBooks)
Cloud-based accounting software has largely replaced desktop accounting applications in Australia, enabling real-time financial visibility, automated bank feeds, and seamless collaboration between business owners and accountants. The major platforms: Xero – the dominant cloud accounting platform in Australia and New Zealand; excellent bank reconciliation, payroll, invoicing, and integrations; strong accountant and bookkeeper ecosystem; MYOB – Australia’s oldest accounting software brand; desktop software has transitioned to cloud; popular with larger businesses and those needing more complex inventory/payroll; QuickBooks Online – US-origin platform with strong Australian presence; good for small businesses; Reckon – Australian alternative, popular in professional services. Key capabilities to look for: bank feeds, ATO integration (BAS lodgement, STP payroll), invoicing, payroll, inventory management, and accountant access. See also: SaaS, Cloud Computing, GST / BAS, eInvoicing.
ACSC (Australian Cyber Security Centre)
The Australian Cyber Security Centre (ACSC) is the Australian Government’s lead agency for cybersecurity, operating within the Australian Signals Directorate (ASD). The ACSC provides: cybersecurity advice and guidance for Australian individuals, businesses, and critical infrastructure; the Essential Eight maturity framework (eight foundational cybersecurity controls every organisation should implement); the ReportCyber portal (cyber.gov.au/report-and-recover) for reporting cyberattacks; real-time threat intelligence sharing with Australian organisations; and the ACSC Partnership Program for businesses to access threat intelligence feeds. The ACSC publishes annual reports on the Australian cyber threat landscape. Their free resources at professional cybersecurity services for any Australian organisation building cybersecurity practices. See also: Cybersecurity, Patch Management, Ransomware.
Activation Lock
Activation Lock is an Apple security feature that ties an iPhone, iPad, Mac, or Apple Watch to the owner’s Apple ID. When “Find My” is enabled, Activation Lock is automatically turned on. The result: even if a thief factory resets your device, they cannot activate or use it without your Apple ID and password. This has dramatically reduced the resale value of stolen Apple devices. Before selling or giving away an Apple device, you must: sign out of iCloud (Settings > [your name] > Sign Out on iPhone; Apple menu > System Settings > [your name] > Sign Out on Mac) which automatically disables Activation Lock. If you buy a used iPhone that is Activation Locked (asks for the previous owner’s Apple ID at setup), the previous owner must either sign out remotely via iCloud.com or you must return the device – Apple Mac and iPhone support. See also: Find My, Apple ID, Factory Reset.
Active Directory / Azure AD / Entra ID
Active Directory (AD) is Microsoft’s on-premises directory service that manages user accounts, computers, printers, and security policies in a Windows-based organisation. It allows IT administrators to centrally control who can log into which computers, what files they can access, and what software they can install – from a single server (Domain Controller). Microsoft Entra ID (formerly Azure Active Directory or Azure AD) is the cloud-based equivalent, enabling single sign-on (SSO) to Microsoft 365, Azure, and thousands of third-party cloud applications. business IT setup and Active Directory configuration with more than 5-10 computers use some form of Active Directory or Entra ID to manage their IT environment. Key concepts: domain, group policy, organisational unit (OU), SSO, and LDAP. See also: Server, Cloud Computing, Zero Trust Security, User Account.
Ad Blocker
An ad blocker is a browser extension or network-level tool that prevents advertisements from loading on websites. Most ad blockers work by comparing page elements against lists of known advertising domains and blocking matching network requests before the content loads. Benefits: faster page loading (ads are often the slowest elements); less data usage; reduced tracking by advertising networks; and professional malware and adware removal. Popular ad blockers: uBlock Origin (free, open-source, most efficient, highly recommended); AdBlock Plus; Ghostery. Network-level options like Pi-hole (self-hosted DNS blocker) and NextDNS block ads for all devices on a network without browser extensions. Note: many websites rely on advertising revenue; some block content for ad blocker users. See also: Browser, Plugin / Extension, Malvertising, DNS.
ADSL / ADSL 2+ (Asymmetric Digital Subscriber Line)
Like dial-up internet, ADSL used a regular copper telephone line to connect your computer to the internet, but at much higher speeds. One of the main advantages of ADSL over dial-up was that you could use your telephone line at the same time as using the internet. The ADSL network in Australia was progressively shut down from 2020 onwards as the PSTN (public switched telephone network) was decommissioned and replaced by the National Broadband Network (NBN). If any device on your network is still configured for ADSL, professional NBN migration assistance to arrange migration to NBN or an alternative broadband service. See also: NBN, Broadband, Dial-up Internet.
Agentic AI / AI Agents
An AI agent is an AI system that can autonomously take actions, use tools, and work toward goals over multiple steps without continuous human guidance – rather than simply responding to a single prompt. An agent might: browse the internet, run code, query databases, send emails, book appointments, manage files, or call external APIs as part of completing a multi-step task. Examples: an AI agent that researches a topic, writes a report, formats it, and emails it – all from one instruction; or an agent that monitors stock prices and executes trades. Key concepts: ReAct (Reason + Act loops); tool use (the model deciding which tools to call); memory (maintaining context across steps); and multi-agent systems (multiple specialised agents collaborating). Agentic AI represents the frontier of AI capability in 2024–2025. See also: Generative AI, Large Language Model (LLM), API, Webhook.
Agile / Scrum / Kanban
Agile is a set of business IT and software services and project management principles that prioritise iterative delivery, collaboration, customer feedback, and flexibility over rigid upfront planning. The Agile Manifesto (2001) values: individuals over processes; working software over documentation; customer collaboration over contracts; responding to change over following a plan. Scrum is the most widely used Agile framework: work is organised into fixed-length iterations called sprints (typically 2 weeks); a Product Owner prioritises the backlog of features; a Scrum Master facilitates the process; teams hold daily stand-up meetings (15 minutes), sprint reviews, and retrospectives. Kanban is a visual workflow management method using columns (To Do, In Progress, Done) to limit work-in-progress and improve flow. Both are widely used in software development and increasingly in marketing, HR, and operations. See also: DevOps, CI/CD, Project Management Software.
AI Chatbot
An AI chatbot is a software program that uses Artificial Intelligence – specifically Large Language Models (LLMs) – to understand and respond to text or voice conversations in a human-like way. Modern AI chatbots like ChatGPT (OpenAI), Claude (Anthropic), and Gemini (Google) can write essays, answer complex questions, generate code, analyse images, summarise documents, and assist with an enormous range of tasks. Unlike older rule-based chatbots that followed rigid scripts, modern AI chatbots learn from vast datasets and handle nuanced, open-ended conversations. Businesses are rapidly deploying AI chatbots for customer service automation, IT helpdesks, sales support, and internal knowledge management. See also: Artificial Intelligence, Large Language Model (LLM), Generative AI.
AI Coding Assistants
AI coding assistants are tools that help developers write, review, debug, and understand code using large language models. They represent one of the most transformative AI applications for technical workers. GitHub Copilot – the market leader; integrates into VS Code, JetBrains IDEs, and others; suggests code completions as you type; can write entire functions from a comment; supports all major languages; subscription required ($10–19 USD/month). Cursor – an AI-first code editor built on VS Code; multi-file editing context; codebase-aware chat. Windsurf (Codeium) – free tier available; strong performance on many benchmarks. Claude in the terminal (Claude Code) – Anthropic’s agentic coding tool for complex multi-file tasks. ChatGPT and Claude via chat interfaces can also review code, explain errors, and generate scripts for those who don’t use dedicated IDEs. For non-developers, AI coding tools have lowered the bar for automation – many business users can now write simple Python or JavaScript scripts for tasks that previously required hiring a developer. See also: Programming Language, IDE, Generative AI, Large Language Model (LLM).
AI Computing / AI PC
AI Computing refers to using specialised hardware and software infrastructure to run artificial intelligence workloads – including training machine learning models, running inference (applying trained models to new data), and processing large-scale datasets. AI computing relies heavily on GPUs (Graphics Processing Units) and increasingly on dedicated NPUs (Neural Processing Units) built into modern processors. An AI PC is a new category of personal computer (coined around 2024) that includes a built-in NPU alongside the CPU and GPU, enabling AI tasks like real-time transcription, background removal in video calls, image generation, and local AI assistants to run directly on the device without relying on cloud servers. Major chip makers including Intel (Core Ultra), AMD (Ryzen AI), Apple (M-series Neural Engine), and Qualcomm (Snapdragon X) all now include NPUs in their latest processors. See also: GPU, Artificial Intelligence, Deep Learning, Large Language Model (LLM).
AI in Healthcare / Medical AI
Artificial intelligence is transforming healthcare across multiple domains: Medical imaging – AI algorithms analyse X-rays, CT scans, MRIs, and pathology slides, achieving accuracy comparable to or exceeding specialist radiologists in detecting cancers, diabetic retinopathy, cardiovascular disease, and bone fractures. Drug discovery – AI (including AlphaFold, which predicted the structure of virtually all known proteins) dramatically accelerates identifying drug candidates and predicting their behaviour. Clinical decision support – AI analyses patient records to flag medication interactions, suggest diagnoses, and identify high-risk patients. Genomics – AI analyses genetic sequences to identify disease risk and personalise treatment. Administrative automation – AI handles transcription of clinical notes, coding of diagnoses, and insurance prior authorisation. Australia has a National Digital Health Strategy that includes AI-assisted care pathways. See also: Artificial Intelligence, Machine Learning, Telehealth, Deep Learning.
AI Image Generation
AI image generation tools create images from text descriptions (text-to-image prompts) using diffusion model AI. The leading tools: Midjourney – produces the highest-quality artistic images; subscription-based; operated via Discord; preferred by professional designers and concept artists. DALL·E 3 (OpenAI) – integrated into ChatGPT Plus and Microsoft Copilot; excellent at following complex instructions; good at text in images. AI workstation setup and GPU upgrades – open-source model that can be run locally on a PC with a capable GPU (via Automatic1111, ComfyUI); massive community of custom models; full control with no censorship. Adobe Firefly – trained only on licensed images; commercially safe; integrated into Photoshop and Illustrator. Ideogram – exceptional at generating accurate text within images. Flux – newer open model rivalling commercial quality. Applications: concept art, marketing imagery, product visualisation, architectural renders, book covers. Legal consideration: AI image copyright ownership remains unsettled globally; commercially generated AI images should be used with awareness of evolving legal frameworks. See also: Generative AI, Diffusion Model, GPU.
AI Safety / AI Alignment
AI safety is the field of research concerned with ensuring that AI systems behave in ways that are beneficial, safe, and aligned with human values and intentions – particularly as AI systems become more capable. Key challenges: Alignment – ensuring AI goals and values match human intentions (an AI optimising for one metric may achieve it in unexpected, harmful ways); Interpretability / Explainability – understanding why an AI makes specific decisions (a “black box” problem); Robustness – ensuring AI behaves reliably under unusual inputs and adversarial attacks; Misuse prevention – preventing AI from being used to generate CSAM, bioweapon designs, or mass disinformation; and Existential risk – longer-term concerns about highly capable AI systems. Anthropic (creator of Claude), OpenAI, and DeepMind have dedicated AI safety research teams. See also: Artificial Intelligence, Generative AI, Large Language Model (LLM).
AI Transcription / Voice-to-Text
AI transcription converts spoken audio or video to text automatically using speech recognition models. Modern AI transcription is remarkably accurate and has transformed meeting documentation, podcasting, accessibility, and note-taking. Meeting transcription: Microsoft Teams, Zoom, and Google Meet all have built-in AI transcription; Otter.ai, Fireflies.ai, and Fathom are dedicated meeting transcription tools that join calls as a bot and produce searchable transcripts with speaker identification and AI summaries. Audio/video transcription: Whisper (OpenAI’s open-source model, used in many tools) provides very high accuracy across many languages and accents; can run locally for privacy. Voice-to-text dictation: Windows 11 dictation (Win+H); Apple Dictation (built into all devices); Google Docs voice typing; these use voice recognition for real-time text input while writing. Australian English: major models handle Australian accents well now, though names, places, and technical terms may still need correction. Transcription raises privacy considerations when meeting content is processed on third-party servers. See also: AI Chatbot, Voice Assistant, Generative AI, Accessibility Features.
Air Gap
An air gap is a security measure in which a computer or network is physically isolated from the internet and other unsecured networks – there is literally a gap of air between it and any outside connection. Air-gapped systems provide the highest possible protection against remote attacks, as there is no network path for malware to travel over. Air gaps are used to protect: industrial control systems (power plants, water treatment, nuclear facilities); classified government and military systems; high-security financial systems; and critical backup copies of data (data recovery and backup solutions that hasn’t reached the offline device). Air-gapped systems are not impenetrable – the famous Stuxnet attack against Iranian nuclear centrifuges used infected USB drives to cross the air gap. See also: Cloud Backup, Ransomware Recovery, Cybersecurity.
AirDrop / Nearby Share Security
AirDrop (Apple) and Nearby Share (Android) are wireless file sharing technologies allowing direct device-to-device transfers without internet. Security considerations: AirDrop “Everyone” setting – setting AirDrop to receive from “Everyone” allows any nearby Apple device to send you files and potentially reveal your name and profile photo to strangers; use “Contacts Only” or “Receiving Off” in public places. In 2023, Apple changed the “Everyone” setting to automatically expire after 10 minutes. AirDrop receipt without consent – with “Everyone” enabled, strangers can send unsolicited images in public places (sometimes explicit, known as “cyber flashing” – now a criminal offence in most Australian states). Security tip: Apple device security advice “Contacts Only” in Settings > General > AirDrop on iPhone; use “Receiving Off” when in crowded public spaces. See also: Bluetooth, Wi-Fi, iPhone Security.
Algorithm
An algorithm is a finite, ordered sequence of instructions or rules that a computer follows to solve a problem or accomplish a task. Algorithms are the fundamental building blocks of all software. A sorting algorithm arranges a list of items in order; a search algorithm finds a specific item; a compression algorithm reduces file sizes; and a recommendation algorithm (like those used by Netflix, YouTube, or TikTok) determines what content to show you based on your behaviour. The quality of an algorithm – measured in speed (time complexity) and memory usage (space complexity) – has enormous real-world impact. Algorithm design is central to computer science. In common usage, “the algorithm” often refers to the complex, proprietary recommendation systems used by social media platforms to determine what content users see. See also: Artificial Intelligence, Machine Learning, Programming Language.
All-in-One Printer / Multifunction Device
An all-in-one (AIO) printer, also called a multifunction device (MFD) or multifunction printer (MFP), combines multiple office functions in a single unit: printing, scanning, and copying at minimum, with many models also including faxing. All-in-ones are available in inkjet and laser variants. For home and small business use, popular brands include HP, Canon, Epson, and Brother. When choosing an all-in-one, consider: print speed (pages per minute), print quality (DPI), paper sizes supported (A4, A3), ink/toner costs (often higher than the initial printer price over time), wireless printing support, automatic double-sided printing (duplex), and the scanner’s glass bed size and maximum scan resolution. Ink tank printers (Epson EcoTank, Canon MegaTank) have refillable ink tanks instead of cartridges, offering significantly lower ongoing ink costs. See also: Printer, Scanner, USB, Wi-Fi.
Android Security Features
Android’s security architecture includes multiple protective layers: Google Play Protect – continuously scans all installed apps for malware, including sideloaded apps; runs on over 3 billion devices; App sandboxing – apps run in isolation; Permission model – granular control over what each app can access (Settings > Apps > [app name] > Permissions); SafetyNet / Play Integrity API – allows apps (banking, payment) to verify the device hasn’t been rooted or compromised; Android Enterprise – work profile system creating a separate, managed space on personal phones for work apps and data (MDM-compatible); Titan M / Titan M2 chip (Google Pixel devices) – dedicated security chip similar to Apple’s Secure Enclave; Verified Boot – ensures the OS hasn’t been tampered with during startup; Encryption – all Android devices encrypt storage by default. Android’s more open ecosystem (sideloading, diverse manufacturers) creates more attack surface than iOS, but the security model is Android device security setup. See also: Google Play Protect, Rooting / Jailbreaking, MDM, Phone Security Checklist.
Anycast / Multicast / Broadcast
These terms describe different ways of addressing and delivering network packets to multiple destinations: Unicast – one sender to one receiver (most internet traffic). Broadcast – one sender to all devices on a local network segment; used by protocols like DHCP for discovery. Multicast – one sender to a group of subscribed receivers; efficient for live video streaming (IPTV) and group communications where many receivers need the same data simultaneously. Anycast – the same IP address is announced from multiple geographic locations; incoming traffic is routed to the nearest available node. Cloudflare’s 1.1.1.1 DNS resolver and Google’s 8.8.8.8 use anycast – your query goes to the nearest of their global nodes automatically. This is also how CDNs achieve low latency worldwide. See also: CDN, DNS, Latency, Protocol.
API (Application Programming Interface)
An API is a set of rules and protocols that allows different software applications to communicate with each other. Think of it like a waiter in a restaurant: you (the application) tell the waiter (the API) what you want, and the waiter fetches it from the kitchen (another system) and brings back the result. APIs are fundamental to how the modern internet works – when you log into a website using your Google account, when a weather widget shows real-time data, or when your accounting software syncs with your bank, APIs are doing the work. REST and GraphQL are the most common API architectures today. See also: Cloud Computing, SaaS.
REST API / GraphQL
REST (Representational State Transfer) is the most widely used architecture for building web APIs. REST APIs use standard HTTP methods: GET (retrieve data), POST (create data), PUT/PATCH (update data), DELETE (delete data). Resources are identified by URLs (e.g., /api/users/123) and responses are typically formatted in JSON. REST is stateless – each request contains all necessary information. GraphQL (developed by Meta/Facebook) is an alternative where clients specify exactly what data they need in a single query, eliminating over-fetching and under-fetching. A GraphQL query might get a user’s name, their most recent 3 posts, and each post’s like count in one request – what would take 3 REST calls. GraphQL is popular in mobile apps where bandwidth efficiency matters. See also: API, JSON / XML, Cloud Computing, Web App.
APN (Access Point Name)
An Access Point Name is the configuration setting on a mobile device that tells it how to connect to your mobile carrier’s data network and what internet services you can access. Think of it as the address the phone uses to reach the correct “gateway” on the carrier’s network. APN settings include the carrier’s server address, username, password, and protocol type. Most modern smartphones configure APN settings automatically when you insert a SIM card. However, APN settings sometimes need to be entered manually after switching carriers, buying an unlocked phone, or using a budget MVNO (Mobile Virtual Network Operator). Incorrect APN settings result in mobile data not working even though you have signal bars. Contact your carrier or look up the correct APN settings on their website. See also: SIM Card, 5G, ISP.
App / Application / Software
An app (short for application) is any program you run on a computer, tablet, or smartphone to perform a specific task. On a smartphone, apps are downloaded from the App Store (Apple) or Google Play Store (Android). On a computer, they are typically called programs or software – though the word “app” is now used universally. Examples include Microsoft Word (word processing), Google Chrome (web browser), Spotify (music), Zoom (video calls), and Microsoft Excel (spreadsheets). Software is the broad term for all programs, while hardware refers to the physical components you can touch. The key distinction: if you drop your computer, you damage the hardware; if a program stops working, it is a software problem. See also: Operating System, SaaS, Open Source Software.
Apple Configurator / MDM for Mac
Apple Configurator 2 is Apple’s free macOS app for deploying and managing iPhone, iPad, and Apple TV devices in organisations – particularly schools and businesses. It allows IT administrators to: enrol devices in Mobile Device Management (MDM); install apps and profiles; configure settings and restrictions; supervise devices (enabling more restrictive management); and restore or update multiple devices simultaneously. Apple Business Manager (ABM) and Apple School Manager (ASM) are web portals that allow organisations to purchase apps in bulk, enrol devices automatically when unboxed (Zero Touch deployment), and integrate with Apple Business Manager and MDM setup, Microsoft Intune, or Mosyle. For organisations with Mac computers and Apple devices, MDM provides centralised control over security policies, software deployment, and compliance. See also: MDM, Active Directory, macOS Security.
Apple ID / iCloud Account Security
Your Apple ID is the master account that controls access to all Apple services: iCloud storage, the App Store, iTunes/Music purchases, iMessage, FaceTime, Find My, iCloud Keychain (passwords), Apple Pay, and any subscriptions. It is one of the most valuable accounts to secure. Key security steps: Strong unique password – never share your Apple ID password with anyone; Apple support will never ask for it; Two-Factor Authentication (2FA) – mandatory on modern Apple devices; a code is sent to your trusted devices when signing in from a new location; Trusted phone number – keep your recovery phone number up to date; Recovery key or account recovery contact – configure these before you need them; Sign-In & Security (Settings > [your name] > Sign-In & Security) – review active sessions and revoke any unfamiliar devices. Apple account recovery and Mac security, attackers can lock you out of your device via Lost Mode, erase it remotely, and access all your photos, messages, and passwords. See also: Multi-Factor Authentication (MFA), iCloud, Find My, Password Manager.
Apple Silicon (M-Series Chips)
Apple Silicon refers to Apple’s custom ARM-based processors designed in-house, replacing Intel CPUs in Mac computers from November 2020 onward. The M-series represents a fundamental shift in Mac performance and efficiency. M1 (2020) – first Apple Silicon; dramatically outperformed Intel Macs at a fraction of the power consumption; unified memory architecture (CPU, GPU, and Neural Engine share a single pool of fast memory). M2 (2022) – improved CPU/GPU performance and efficiency. M3 (2023) – first built on 3-nanometre process; ray tracing support, faster GPU. M4 (2024) – focused on AI performance; massive Neural Engine improvements for Apple Intelligence. Professional variants: M-Pro (more cores, more memory bandwidth), M-Max (even more), M-Ultra (two Max chips interconnected). Apple Silicon Mac repairs and support natively (though Parallels can run ARM Windows). See also: CPU, GPU, AI Computing / AI PC, macOS Versions.
Augmented Reality (AR) and Virtual Reality (VR)
Virtual Reality (VR) uses a headset to completely immerse you in a computer-generated environment, replacing everything you see with a digital world. Popular VR headsets include the Meta Quest, Sony PlayStation VR2, and Apple Vision Pro. VR is used in gaming, training simulations, architecture visualisation, education, and rehabilitation therapy. Augmented Reality (AR) overlays digital information or objects onto your real-world view – for example, Pokémon GO placing virtual creatures in the real world through your phone camera, or an AR surgical system displaying patient data over a surgeon’s field of view. Mixed Reality (MR) combines both, allowing digital objects to interact meaningfully with the physical environment. Spatial Computing is the broader term now used to describe all immersive computing experiences that blend physical and digital worlds. The Apple Vision Pro headset (released 2024) represents a major step in mainstream spatial computing. See also: Metaverse, GPU.
Artificial Intelligence (AI)
Artificial Intelligence refers to computer systems designed to perform tasks that would normally require human intelligence – such as understanding language, recognising images, making decisions, writing text, translating languages, or playing strategic games. Modern AI is largely powered by Machine Learning, where systems are trained on massive datasets rather than being manually programmed with explicit rules. AI is now embedded in everyday tools including email spam filters, voice assistants (Siri, Google Assistant), recommendation engines (Netflix, Spotify), medical diagnostic imaging, fraud detection systems, and autonomous vehicles. The rapid advancement of Generative AI since 2022 has brought AI capabilities into mainstream public awareness and everyday business use. See also: Machine Learning, Deep Learning, Generative AI, Neural Network, Large Language Model (LLM), AI Computing / AI PC.
ASCII / Unicode
ASCII (American Standard Code for Information Interchange) is one of the earliest character encoding standards, assigning numbers 0–127 to represent letters (uppercase and lowercase), digits, punctuation, and control characters (like newline and tab). ASCII was designed for English and covers only 128 characters. Unicode is the universal character encoding standard that solves ASCII’s limitation – it defines code points for over 149,000 characters covering virtually all human writing systems, mathematical symbols, emojis, historical scripts, and more. UTF-8 is the most common Unicode encoding format on the web (used by over 98% of websites): it is variable-length (ASCII characters use 1 byte; others use 2–4 bytes), backwards compatible with ASCII, and space-efficient. When a webpage shows garbled characters or ??? or □ symbols, it typically indicates a character encoding mismatch. See also: Byte, Binary / Hexadecimal, HTML / CSS / JavaScript.
Aspect Ratio
Aspect ratio is the proportional relationship between a display’s width and height. Common aspect ratios: 16:9 (widescreen) – the universal standard for HD and 4K televisions, laptop screens, and most computer monitors; matches standard video content from YouTube, Netflix, Blu-ray. 21:9 / 32:9 (ultrawide) – wide monitor formats popular for gaming, trading, and professional productivity; dramatically expands field of view in games; allows two or three full applications side-by-side; 16:10 – slightly taller than 16:9; popular on MacBooks and professional monitors; provides more vertical screen real estate for documents and web pages. 4:3 – the old TV/monitor standard; now used mainly in presentations (PowerPoint default) and retro gaming. 1:1 – square format; Instagram photos, some specialty displays. See also: Monitor, 4K / 8K Resolution, Pixel.
ATO (Australian Taxation Office) Digital Services
The Australian Taxation Office provides comprehensive digital services for individual taxpayers and businesses: myTax – the online income tax return tool accessed through myGov; pre-fills income information from employers, banks, and government agencies; most simple returns completed in minutes; ATO app – check tax file status, set up payment plans, track refunds, manage business activity statements; Business Portal / Online services for business – business IT and accounting software setup (Business Activity Statements), paying PAYG withholding, managing single touch payroll; myDeductions – track work-related expenses throughout the year; ABN Lookup (abn.business.gov.au) – verify if an ABN (Australian Business Number) is valid; Single Touch Payroll (STP) – all Australian employers must report payroll to the ATO in real time through payroll software. See also: myGov, Digital ID, Cloud Computing.
Attachment (Email Attachment)
An email attachment is a file – a document, photo, spreadsheet, PDF, or other file – that is sent alongside an email message. The recipient can download and open the attachment on their device. Most email services limit attachment size (typically 10–25MB); for larger files, sharing via a cloud link (Google Drive, OneDrive, Dropbox) is recommended instead. Security warning: email attachments are one of the most common methods used to spread malware. Never open an attachment from an unknown sender, and be very cautious with unexpected attachments even from known contacts – their account may have been compromised. Common dangerous attachment types include .exe, .zip, .docm (macro-enabled Word), and .xlsm files. See also: Email, Malware, Phishing, Cloud Backup.
Autonomous Vehicles / Self-Driving Technology
Autonomous vehicles (AVs) are vehicles capable of sensing their environment and navigating without human input, using a combination of sensors (LiDAR, radar, cameras, ultrasonic sensors), high-definition mapping, and AI-powered decision systems. The SAE International autonomy levels define the spectrum: Level 0 (no automation); Level 1 (driver assistance – adaptive cruise control); Level 2 (partial automation – Tesla Autopilot, GM Super Cruise); Level 3 (conditional automation – driver can disengage attention in some conditions); Level 4 (high automation – no driver needed in defined areas); Level 5 (full automation – anywhere, any conditions). True Level 4/5 autonomy remains challenging due to edge cases, adverse weather, and ethical decision-making. Waymo operates commercial robotaxi services in parts of the US. In Australia, autonomous trucking trials are underway in Queensland. See also: Artificial Intelligence, Machine Learning, IoT.
Backup vs Data Recovery
Understanding the difference between backup and data recovery is critical: Backup is a proactive process – regularly copying your data to a second location (external drive, NAS, or cloud) while everything is working, so you can restore it if something goes wrong. Backup is planned, automated, and inexpensive. Data recovery is a reactive process – attempting to retrieve data that has already been lost due to drive failure, accidental deletion, formatting, ransomware, or physical damage, without the aid of a prior backup. Data recovery is unplanned, complex, expensive, and not always fully successful. The what to do when you lose data in data recovery: the need for it almost always means a backup plan was absent or failed. professional data recovery “data recovery” is a current backup. See also: Cloud Backup, RAID, Data Recovery, Ransomware Recovery.
Bad Sectors
A bad sector is a section of a hard drive platter or SSD storage cell that has become damaged and can no longer reliably store data. On a traditional HDD, bad sectors occur when the magnetic coating on the platters degrades, is physically scratched by the read/write head (a “head crash”), or is corrupted by sudden power loss. On an SSD, bad sectors occur when NAND flash cells wear out after too many write cycles. Soft bad sectors contain corrupted data but the physical area is intact – they can sometimes be repaired by rewriting the sector. Hard bad sectors are physically damaged areas that cannot be repaired and must be mapped out (marked as unusable) by the drive’s firmware. Increasing numbers of bad sectors is a serious warning sign of what to do when your hard drive is failing. Check hard drive health with tools like learn more about mechanical hard drive failures (Windows) or SMART monitoring utilities. See also: SMART Data, Data Recovery, Hard Drive (HDD), Head Crash.
Bandwidth
Bandwidth refers to the maximum amount of data that can be transmitted over an internet or network connection in a given period, usually measured in Mbps (megabits per second) or Gbps (gigabits per second). Think of it like a water pipe: the wider the pipe, the more water (data) can flow simultaneously. Higher bandwidth means you can stream 4K video, run multiple video calls, and download large files at the same time without slowdowns. Bandwidth is different from latency – bandwidth is the capacity of the connection, while latency is the delay or response time. Australian NBN plans are sold based on speed tiers ranging from NBN 25 (25 Mbps) up to NBN 1000 (1 Gbps) for FTTP connections. See also: Broadband, Latency, NBN, Upload.
Barcode Scanner
A barcode scanner is an input device that uses a laser or image sensor to read barcode data printed on labels and products, converting it instantly into text or numbers entered into the computer. Used extensively in retail point-of-sale (POS) systems, warehouse inventory management, healthcare (medication tracking), and logistics. Modern barcode scanners can read traditional 1D barcodes (the stripes on product packaging) as well as 2D QR codes and Data Matrix codes. They connect via USB (most common), Bluetooth (wireless handheld), or Wi-Fi. Most modern smartphones can also function as basic barcode scanners using the camera. See also: QR Code, USB, Bluetooth.
Battery / Laptop Battery Health
A laptop or device battery stores electrical charge so the device can be used without being plugged in. Batteries are rated in milliampere-hours (mAh) or watt-hours (Wh) – higher numbers mean longer battery life between charges. Over time, rechargeable batteries (lithium-ion, lithium-polymer) degrade and hold less charge. A brand new laptop battery typically has 100% capacity; after 2–3 years of regular use, it may retain only 70–80%. Windows 11 has a built-in battery health report (run powercfg /batteryreport in Command Prompt). Signs of a failing battery include: the device shutting down suddenly at 20–30% charge, battery draining much faster than when new, or the battery swelling (a safety hazard requiring laptop battery replacement service). Never use a swollen battery. See also: Charging, UPS, Wireless Charging.
UPS Sizing / Runtime Calculator
Choosing the right UPS (Uninterruptible Power Supply) requires matching its capacity to the load it must support. Key specifications: VA (Volt-Amps) – the maximum load the UPS can support; Watts – the actual power consumed (roughly VA × 0.6–0.8 for most UPS units); Runtime – how many minutes the UPS provides at a given load. Sizing guide: add up the wattage of all devices the UPS will support (computer + monitor + networking gear); multiply by 1.25 (25% safety margin); find a UPS with at least that wattage rating. For a typical home office setup (desktop PC 150W + monitor 30W + router/modem 25W = 205W total), a 600VA/360W UPS provides approximately 10–15 minutes of runtime – enough to save work and shut down properly. For servers or critical business equipment requiring longer runtime, higher-capacity UPS units (1500VA–3000VA+) or an external battery pack are needed. See also: UPS, PSU, Surge Protector.
BCD (Boot Configuration Data)
Boot Configuration Data (BCD) is a database in Windows that stores boot configuration parameters – telling Windows where the operating system files are located and how to start them. BCD corruption is a common cause of Windows failing to start, displaying errors like “Boot BCD error,” “0xc000000f,” or “The Boot Configuration Data file is missing or contains errors.” BCD issues can occur after: abrupt power loss during startup, failed Windows updates, incorrect drive partitioning, or connecting/disconnecting storage drives. The BCD can usually be repaired using the professional Windows repair service (startup repair) or by booting from a Windows installation USB and running bootrec /fixbcd and bootrec /rebuildbcd commands in the Command Prompt. See also: Boot / Startup, MBR / GPT, Data Recovery, BIOS / UEFI.
BGP (Border Gateway Protocol)
BGP is the routing protocol that makes the internet work – often called the “postal service of the internet.” BGP enables the tens of thousands of separate networks (ISPs, corporations, cloud providers) that make up the global internet to exchange routing information with each other, so that data packets can find their way from any source to any destination across the world. Each network (called an Autonomous System, or AS) announces which IP address ranges it is responsible for. BGP route manipulation is a known attack vector – BGP hijacking occurs when a network announces routes it shouldn’t, redirecting internet traffic through an attacker’s infrastructure. Major BGP incidents have caused widespread internet connectivity troubleshooting. RPKI (Resource Public Key Infrastructure) is a security framework being adopted to prevent BGP hijacking. See also: Protocol, IP Addressing, Network.
Binary / Hexadecimal / Number Systems
Computers operate using binary – a base-2 number system with only two digits: 0 and 1. All data in a computer – text, images, instructions, everything – is ultimately stored and processed as patterns of 0s and 1s. This is because electronic circuits naturally have two states: on (1) or off (0). Hexadecimal (hex) is a base-16 number system using digits 0–9 and letters A–F, providing a compact way for humans to represent binary data (each hex digit represents exactly 4 binary bits). You’ll encounter hex in: MAC addresses (e.g., 00:1A:2B:3C:4D:5E), IP addresses in IPv6, HTML colour codes (#FF5733), memory addresses, and programming. Decimal is the everyday base-10 system (0–9) that humans use naturally. Converting between bases is a fundamental programming skill. See also: Bit, Byte, Checksum / Hash Function, Hex Editor.
Biometrics
Biometrics refers to the use of unique physical or behavioural characteristics to identify and authenticate individuals. Common biometric technologies include fingerprint scanners (used in most modern smartphones and laptops), facial recognition (Face ID on iPhones, Windows Hello on PCs), iris scanning, voice recognition, and behavioural patterns like typing rhythm or gait. Biometrics are increasingly used in cybersecurity as a more secure alternative to passwords, since biometric data is inherently linked to a specific individual and cannot be guessed or easily stolen like a text password. Many Australian banks now use biometric authentication for app logins. Biometrics are also used in border control (Australian Smart Gates at airports use facial recognition), access control systems, and time-and-attendance systems. See also: Multi-Factor Authentication (MFA), Windows Hello, Cybersecurity.
BIOS / UEFI (Basic Input/Output System / Unified Extensible Firmware Interface)
BIOS and UEFI are the firmware programs stored on a small chip on your motherboard that run the instant you press the power button, before your operating system loads. They perform a Power-On Self Test (POST) to check that hardware components are working, then locate and launch your operating system (Windows, macOS, Linux). BIOS is the older standard, limited to a text-based interface and 16-bit processing. UEFI is the modern replacement, offering a graphical interface, mouse support, faster boot times, support for large hard drives (over 2TB), Secure Boot (which prevents unauthorised bootloaders and malware from loading), and network features. You access the UEFI/BIOS setup by pressing a key (typically F2, F10, F12, or Delete) during startup. professional computer maintenance can fix security vulnerabilities and improve hardware compatibility. See also: Motherboard, OS (Operating System), TPM.
BIOS / UEFI Update (Flashing)
Updating (or “flashing”) your computer’s BIOS or UEFI firmware installs a new version of the motherboard’s fundamental software. BIOS updates are released by motherboard manufacturers to: fix security vulnerabilities (including Spectre/Meltdown-type CPU vulnerabilities); add support for new processors; improve RAM compatibility and XMP profiles; fix stability issues; improve power management; and add new features. BIOS updates are performed through: the manufacturer’s Windows-based update utility (easiest, recommended for most users); USB flash drive (booting from a specially prepared USB); or built-in UEFI update function (internet-connected UEFI can download and install updates directly). Critical warning: a failed or interrupted BIOS update can “brick” a motherboard (make it unbootable). Never interrupt power during a BIOS update. Some modern motherboards support dual BIOS (a backup BIOS chip for recovery). See also: BIOS / UEFI, Firmware, Motherboard.
Bit
A ‘bit’ is the most basic unit of digital information in computing, representing either a ‘1’ or a ‘0’ – the binary language all computers speak. Bits per second (bps) is the common measure for digital data transmission speed. Larger units are used to express higher speeds: kbps (kilobits per second) = 1,000 bits/sec; Mbps (megabits per second) = 1,000,000 bits/sec; Gbps (gigabits per second) = 1,000,000,000 bits/sec. Note: internet speeds are measured in bits (Mbps), while file sizes are measured in bytes (MB, GB) – there are 8 bits in a byte, which is why a 100 Mbps connection doesn’t download 100 MB of data per second (it’s closer to 12 MB/s). See also: Byte, Bandwidth.
BitLocker (Windows Encryption)
BitLocker is Microsoft’s full-disk encryption feature built into Windows 10 Pro, Enterprise, and Windows 11 Pro/Enterprise. It encrypts the entire contents of a drive using AES 128-bit or 256-bit encryption, protecting data from being read if the computer or drive is lost or stolen – even if the thief removes the drive and connects it to another computer. BitLocker uses the TPM (Trusted Platform Module) chip to store the encryption key and verify system integrity at startup. BitLocker Recovery Key – a 48-digit numeric key generated when BitLocker is enabled, essential for recovering access if the TPM fails or the drive is moved to a new system. professional Windows security setup: Microsoft account, USB drive, printout, or Azure Active Directory. Windows Home edition does not include BitLocker (it has a limited “Device Encryption” feature). To check: open File Explorer, right-click your C: drive – if you see “Turn on BitLocker,” it’s available. See also: Encryption, TPM, Windows Versions, Data Recovery.
Bitrate
Bitrate is the amount of data processed per unit of time in a digital media file or stream, measured in bits per second (bps, kbps, Mbps). Higher bitrate generally means higher quality but larger file size or more bandwidth required. For audio: 128 kbps MP3 is acceptable quality; 320 kbps is high quality; FLAC lossless typically runs at 700–1,400 kbps. For video: 1080p streaming uses 4–8 Mbps; 4K HDR streaming uses 15–40 Mbps; broadcast quality is 50+ Mbps. Variable bitrate (VBR) allocates more bits to complex scenes and fewer to simple ones; constant bitrate (CBR) maintains a fixed rate regardless of content. When live streaming or video calling, your upload bitrate is critical – a good live stream needs 5–10 Mbps stable upload. See also: Streaming, Codec, Bandwidth, Upload.
Blockchain
A blockchain is a type of distributed digital ledger that records transactions across a network of computers in a way that is extremely difficult to alter or tamper with. Rather than being stored in one central location, the data is replicated across thousands of computers (nodes), and each new “block” of data is cryptographically linked to the previous one – forming a “chain.” This structure makes historical records very difficult to alter without detection. Blockchain technology underpins cryptocurrencies like Bitcoin and Ethereum, but also has applications in supply chain management, voting systems, digital contracts (called smart contracts), healthcare records, and verifying the authenticity of digital assets (NFTs). See also: Cryptocurrency, NFT, Encryption.
Blu-ray
The Blu-ray Disc (BD) is a digital optical disc storage format designed to supersede the DVD format, capable of storing several hours of high-definition video (720p, 1080p, 4K Ultra HD, and 8K). Blu-ray is primarily used for commercial movies and physical video game distribution (PlayStation 5 uses Ultra HD Blu-ray discs). The name refers to the blue-violet laser used to read the disc, which has a shorter wavelength than the red laser used in DVDs, allowing data to be stored at a much higher density. A standard Blu-ray holds 25–50GB; Ultra HD Blu-ray holds up to 100GB. While streaming services have dramatically reduced physical media sales, Blu-ray remains popular among home theatre enthusiasts for its uncompressed audio and video quality. See also: Streaming, 4K / 8K Resolution.
Bluetooth
Bluetooth is a short-range wireless communication standard that allows devices to exchange data over distances of typically 10–30 metres without cables. It is used to connect wireless peripherals and accessories including headphones, speakers, keyboards, mice, game controllers, smart watches, fitness trackers, hearing aids, and car audio systems. Bluetooth operates in the 2.4 GHz frequency band. Modern versions include Bluetooth 5.0, 5.2, and 5.3 which offer faster speeds, longer range, and improved energy efficiency. Bluetooth Low Energy (BLE) is a variant designed for battery-powered IoT devices and wearables that need to maintain connections for weeks or months on a small battery. AirDrop on Apple devices uses Bluetooth for discovery and Wi-Fi for transfers. See also: Wi-Fi, NFC, IoT, Wearable Technology.
BNPL (Buy Now Pay Later) / Fintech Payments
Buy Now Pay Later (BNPL) services allow consumers to split purchases into instalments – typically 4 fortnightly payments with no interest if paid on time. Major Australian BNPL providers: Afterpay (Block/Square – Australian-founded, now global); Zip Pay/Zip Money (Australian); Humm; Klarna (international). BNPL has been criticised for: encouraging over-spending beyond one’s means; late fees that can accumulate rapidly; and not appearing on credit reports (preventing responsible lending assessments). From 2025, BNPL providers are subject to credit licensing requirements under reforms to the National Consumer Credit Protection Act, requiring affordability assessments. Digital payments fintech: Australia has a vibrant fintech sector – Wise (international money transfers with low fees), Revolut (multi-currency account and travel card), and PayTo (a new payment method built on the NPP allowing direct account debits with customer consent). See also: Digital Wallet, PayID, POS.
Bookmark / Favourite
A bookmark (called a “favourite” in Microsoft Edge and Internet Explorer) is a saved shortcut to a web page in your browser, so you can quickly return to it without typing or searching for the address again. You create a bookmark by pressing Ctrl+D (or Cmd+D on Mac) or clicking the star icon in the address bar. Bookmarks are organised in folders in your browser’s bookmark manager. Most browsers sync bookmarks across your devices when signed in to the same account (Chrome syncs via Google account, Safari via iCloud, Edge via Microsoft account). See also: Browser, Cloud Computing.
Boot / Startup / Reboot
Booting (or starting up) is the process your computer goes through when it is powered on, from the moment you press the power button until the operating system is loaded and ready to use. The term comes from the phrase “pulling yourself up by your bootstraps.” A cold boot means starting from completely powered off; a warm boot or reboot/restart means restarting from a powered-on state (which clears RAM and refreshes the operating system). “Have you tried turning it off and on again?” is genuine IT advice – restarting clears temporary files and memory, stops frozen processes, and resolves many common computer problems. Slow boot times are often caused by too many programs set to start automatically with Windows; these can be managed in Task Manager (Ctrl+Shift+Esc) under the Startup tab. See also: BIOS / UEFI, Operating System, RAM, SSD.
Bootable USB / Recovery Drive
A bootable USB drive contains a complete operating system or recovery environment that can start a computer independently of the installed OS – essential for repairing systems that won’t boot, installing Windows or macOS, running diagnostic tools, or professional data recovery service. Creating a Windows 11 bootable USB: download the Media Creation Tool from microsoft.com; run it on a working computer; select “Create installation media”; choose USB drive; process takes 15–30 minutes. Creating a macOS bootable USB: download macOS from the App Store; use Terminal command sudo createinstallmedia. Uses: install or reinstall Windows/macOS; access Windows Recovery Environment for repair; run Linux live environment (Ubuntu, Kali); run memory testing tools (Memtest86); rescue files from a computer that won’t boot into Windows. A bootable USB should be something every computer owner has prepared before they need it. USB 3.0 drives are significantly faster for booting. See also: Boot, Windows Troubleshooters, Computer Won’t Start, Linux.
Broadband
Broadband is a high-speed, always-on Internet connection. Unlike dial-up, broadband does not tie up a phone line, does not require you to “dial in,” and remains connected continuously. In Australia, broadband is delivered via several technologies: NBN fixed line (fibre, copper, or HFC cable to your premises); Fixed Wireless NBN (tower-based radio signal for regional areas); Sky Muster satellite NBN (for very remote areas); 4G/5G mobile broadband (via a SIM card and router); and Starlink low-earth orbit satellite (SpaceX’s growing network, particularly valuable in rural areas). See also: NBN, Starlink, 5G, ISP.
Browser / Web Browser
A web browser is the software application you use to access and navigate the internet. It requests web pages from servers, interprets HTML, CSS, and JavaScript code, and renders the result as the visual pages you see on screen. Popular browsers include Google Chrome (the most widely used globally), Microsoft Edge, Mozilla Firefox, Apple Safari, and Brave. Browsers also manage bookmarks, browsing history, cookies, saved passwords, and extensions (add-ons that expand browser functionality). Browser choice can affect speed, privacy, battery life, and compatibility with websites. Keeping your browser updated is important for security, as outdated browsers are vulnerable to known exploits. See also: HTML / CSS / JavaScript, Cookie, Private Browsing, HTTPS.
Browser – See: Web Browser
Browser Fingerprinting
Browser fingerprinting is a tracking technique that identifies and tracks users based on a combination of technical characteristics of their browser and device – without using cookies. Each browser configuration leaves a unique “fingerprint” composed of: browser type and version; installed fonts; screen resolution and colour depth; time zone; language settings; hardware specs (CPU cores, RAM); installed plugins; canvas rendering (how the browser draws graphics); and WebGL characteristics. Even if you clear cookies, use private browsing, or use a VPN, your browser fingerprint may remain consistent and trackable across sites. The EFF’s “online privacy and security advice” tool (coveryourtracks.eff.org) can show how unique your browser fingerprint is. Browser fingerprinting is used by advertising networks, fraud detection systems, and increasingly by governments. The Tor Browser is specifically designed to minimise fingerprinting by standardising these attributes. See also: Cookie, Privacy, VPN, Digital Footprint.
BSOD (Blue Screen of Death)
The Blue Screen of Death (BSOD), officially called a “Stop Error” or “Bug Check,” is Windows’ response to a critical system error from which it cannot safely recover – the operating system halts everything and displays a blue screen with error information before restarting. Common BSOD causes: faulty or incompatible drivers (particularly graphics and network drivers); failing hardware (RAM, hard drive, or overheating CPU); corrupted Windows system files; recently installed software or hardware conflicts; and malware causing system corruption. Windows 11 BSODs display a QR code that you can scan to quickly find information about the specific error. professional BSOD and computer crash repair: check recently installed drivers or software; run professional RAM and hardware diagnosis (mdsched.exe) to test RAM; check drive health with SMART tools; and ensure temperatures are not excessive. See also: Crash, Driver, RAM, SMART Data.
Bug / Debugging
A software bug is an error, flaw, or unintended behaviour in a program’s code that causes it to produce incorrect results or behave unexpectedly. The term originated from an actual moth found stuck in a relay of an early Harvard computer in 1947, though the term “bug” for engineering problems predates this story. Bugs range from minor cosmetic glitches (a button in the wrong colour) to critical security vulnerabilities (a flaw that allows unauthorised access). Debugging is the systematic process of finding and fixing bugs – using debugging tools, reading error logs, adding diagnostic print statements, and stepping through code line-by-line in an Integrated Development Environment (IDE). Common bug types include: null pointer errors, off-by-one errors, race conditions, memory leaks, and logic errors. See also: IDE, Open Source Software, professional virus and malware removal.
Business Continuity Planning (BCP)
Business Continuity Planning (BCP) is broader than disaster recovery – while DR focuses on restoring IT systems, BCP addresses how the entire business continues to operate during and after any disruptive event (IT failure, pandemic, building fire, key staff absence, supply chain disruption). A BCP includes: Business continuity policy; Business impact analysis – identifying critical business functions; Recovery strategies – how each function continues (working from home, alternate premises, manual workarounds, outsourcing); Plan documentation – documented procedures accessible even when systems are down; Testing and exercises; and Training. COVID-19 demonstrated that many Australian businesses without BCPs were caught unprepared by a prolonged disruption. ISO 22301 is the international standard for Business Continuity Management Systems. For small businesses: at minimum, document your critical processes, key contacts, data backup locations, and what you would do if your office became inaccessible for a week. See also: Disaster Recovery Plan, Cloud Backup, Remote Work Technology.
BEC (Business Email Compromise)
Business Email Compromise is a sophisticated financial fraud where criminals compromise or spoof a business email account – often that of a CEO, CFO, or accounts payable officer – and use it to trick employees into making unauthorised wire transfers, purchasing gift cards, or disclosing sensitive information. BEC is one of the costliest cybercrimes globally: the FBI’s Internet Crime Complaint Centre (IC3) reported over USD $2.9 billion in BEC losses in 2023. Common BEC scenarios: the “CEO scam” (email appearing from the CEO asking accounts to urgently transfer funds); fake supplier invoice fraud (redirecting legitimate supplier payments to attacker accounts); and payroll diversion (HR instructed to change an employee’s bank account details). protect your business from BEC and scams for any change to payment details, strict approval workflows, and MFA on all email accounts. See also: Email Spoofing, Phishing, Social Engineering, Deepfake.
Business Intelligence (BI) / Data Analytics
Business Intelligence refers to technologies, processes, and tools that collect, integrate, analyse, and present business data to support decision-making. BI transforms raw data from databases, CRMs, ERPs, and other systems into meaningful dashboards, reports, and visualisations. Key components: Data warehouse – centralised repository of structured data from multiple sources; ETL (Extract, Transform, Load) – processes that move data from source systems into the data warehouse; BI/analytics platform – tools for querying, visualising, and reporting on data. Popular BI tools: Microsoft business intelligence and IT services (widely adopted, integrates with Microsoft 365), Tableau (powerful visualisations), Looker/Looker Studio (Google), Qlik. Modern AI-assisted analytics (“AI/BI”) enables natural language queries: ask “What were our top-selling products last quarter?” and get an instant visualised answer. See also: Database, Cloud Computing, Artificial Intelligence.
Byte
A byte is a standard unit of digital data storage – one byte is made up of 8 bits. All digital information is ultimately stored as bytes. Common multiples: 1 Kilobyte (KB) = 1,024 bytes; 1 Megabyte (MB) = 1,024 KB; 1 Gigabyte (GB) = 1,024 MB; 1 Terabyte (TB) = 1,024 GB; 1 Petabyte (PB) = 1,024 TB; 1 Exabyte (EB) = 1,024 PB. To put this in perspective: a standard email might be 50KB; a MP3 song around 5MB; a 4K movie around 50–100GB; and global internet traffic is measured in exabytes per month. See also: Bit, SSD, Cloud Storage.
Cable Internet
Cable Internet is a very high-speed internet connection delivered via hybrid fibre-coaxial (HFC) cable infrastructure – the same physical cable used by Foxtel/pay TV – rather than copper telephone lines. In Australia, Telstra and Optus historically operated their own HFC cable networks in major cities. These networks have now been incorporated into the NBN rollout as NBN HFC connections. If your premises has an HFC connection point, your NBN service is likely delivered over the same cable infrastructure. See also: NBN, Broadband.
Cache / Browser Cache
A cache (pronounced “cash”) is a temporary storage area that saves frequently accessed data so it can be retrieved faster in future. There are several types of cache: Browser cache – your web browser saves copies of web page images, scripts, and stylesheets locally so the page loads faster next time you visit; CPU cache – small, extremely fast memory (L1, L2, L3) built directly into the processor chip to reduce wait times; DNS cache – stores recently looked-up domain-to-IP address mappings to speed up browsing; Application cache – apps store data locally to reduce server requests. Clearing your browser cache can fix many common web browsing problems (pages not loading correctly, outdated content displaying). See also: Browser, CPU, DNS.
CAPTCHA
CAPTCHA stands for “Completely Automated Public Turing test to tell Computers and Humans Apart.” It is a security challenge designed to verify that a user is a human rather than an automated bot or script. Traditional CAPTCHAs asked users to identify distorted letters or numbers. Modern versions include Google’s reCAPTCHA (which analyses browsing behaviour and only presents a challenge if suspicious) and image-based challenges (select all images containing traffic lights). CAPTCHAs are used to prevent bots from creating fake accounts, submitting spam forms, conducting credential-stuffing attacks, and scraping web content. As AI has become better at solving traditional CAPTCHAs, more sophisticated challenges have been developed. See also: Cybersecurity, Bot.
CD Burner (Compact Disc Burner)
A CD burner lets you create (“burn”) CDs by writing data to blank discs using a high-powered laser. CD burners are now largely obsolete, replaced by USB flash drives and cloud storage for data transfer and backup. However, optical disc drives (often combined CD/DVD/Blu-ray writers) are still used for playing or creating physical media. Many modern ultra-thin laptops no longer include optical drives at all, requiring an external USB drive if disc access is needed. See also: Blu-ray, USB, Cloud Backup.
CDN (Content Delivery Network)
A Content Delivery Network is a geographically distributed network of servers (called edge nodes or Points of Presence) that cache and deliver web content – images, videos, scripts, and files – from a location physically close to the user requesting it. Instead of every Australian user’s request for a website image travelling to a server in the US, a CDN serves that image from an edge node in Sydney or Melbourne – dramatically reducing load times. CDNs also provide: DDoS attack mitigation (by absorbing traffic across many nodes); high availability (if one server fails, others take over); and reduced load on the origin server. Major CDN providers include Cloudflare, Akamai, AWS CloudFront, and Fastly. website performance and IT services. See also: Web Hosting, Latency, Cloud Computing, WAF.
Centrelink Online / Services Australia Digital
Services Australia is the Australian Government agency delivering Centrelink, Medicare, and Child Support services. Digital access has transformed how Australians access these services: myGov (my.gov.au) – the central portal linking all government services; Centrelink, Medicare, Child Support, NDIS, and other services are all accessible after signing in with your myGov account. Express Plus mobile apps – Centrelink, Medicare, and Child Support apps for smartphones allowing: reporting income; checking payment details; viewing letters; updating circumstances; submitting documents. Phone self-service – automated phone lines (1800 169 468 Centrelink; 132 011 Medicare) for simple transactions. Digital identity verification – linking myGov to Centrelink now requires identity proofing using myID (previously myGovID). Centrelink scam warning: Services Australia will never ask for your myGov password, send unsolicited links to login pages, or request payment via gift cards or cryptocurrency. All legitimate correspondence can be viewed in your myGov inbox. See also: myGov, Digital ID, Online Scam Types, My Health Record.
Certificate Authority (CA) / SSL Certificate
A Certificate Authority is a trusted organisation that issues digital certificates – electronic credentials that verify the identity of websites, organisations, and individuals. When you visit a website with HTTPS, your browser checks that the site’s SSL/TLS certificate was issued by a CA it trusts. If the certificate is valid and trusted, the padlock appears; if not, you see a security warning. Major public CAs include DigiCert, Sectigo, GlobalSign, and (freely) Let’s Encrypt – which has dramatically increased HTTPS adoption by providing free automated certificates. Types of SSL certificates: Domain Validated (DV) – only verifies domain ownership (the most common, provided free by Let’s Encrypt); Organisation Validated (OV) – verifies the organisation’s identity; Extended Validation (EV) – highest verification level, historically showed the company name in green in the address bar (now deprecated by most browsers). See also: HTTPS / SSL / TLS, Encryption, Digital Signature.
CGNAT (Carrier-Grade NAT)
Carrier-Grade NAT is a large-scale NAT (Network Address Translation) system implemented by ISPs to share a single public IPv4 address among many customers. Due to the exhaustion of available IPv4 addresses, ISPs cannot provide every customer with a unique public IP. With CGNAT, hundreds of customers share one public IP. Problems caused by CGNAT: port forwarding becomes impossible (you can’t forward ports through CGNAT); VPN server hosting at home won’t work; some online game matchmaking features fail; remote access to home devices is blocked; and dynamic DNS services don’t function. Solutions: professional internet connectivity solutions (usually available for an extra fee); switch to an ISP without CGNAT; or use IPv6 (which provides a unique address for every device). See also: NAT, IP Addressing, ISP, Port Forwarding.
Chain of Custody (Digital Forensics)
In digital forensics and legal data recovery, chain of custody refers to the documented, chronological record of who handled digital evidence, when, where, and what was done with it – from the moment it was collected until it is presented in court or our forensic data recovery service. Maintaining chain of custody is essential when data recovery involves potential legal proceedings (fraud investigations, employee misconduct, criminal cases, or litigation). A proper chain of custody: uses write blockers when imaging drives (to prevent accidental modification); creates forensic images and verifies them with cryptographic hash values (MD5/SHA-256); documents every action with timestamps; stores evidence in tamper-evident packaging; and restricts access to authorised personnel only. See also: Data Recovery, Forensic Imaging, Write Blocker, Disk Image.
ChatGPT for Business / AI Writing Tools
ChatGPT is OpenAI’s AI chatbot, available at chat.openai.com. The free tier (GPT-3.5) provides capable text generation; ChatGPT Plus ($20 USD/month) provides access to GPT-4, image generation via DALL-E, code execution, and web browsing. ChatGPT Team and Enterprise plans offer: data privacy (conversations not used for training); admin controls; SSO integration; and higher usage limits. Business use cases: drafting and editing documents, emails, reports, and marketing copy; summarising long documents and research; brainstorming and ideation; code writing and debugging assistance; customer FAQ drafting; translation. Other AI writing tools: Claude (Anthropic) – strong at long documents and nuanced writing; Gemini (Google) – integrated with Google Workspace; Grammarly AI – editing and tone adjustment; Jasper – marketing content focus; Copy.ai – sales and marketing copy. Important: always review AI-generated content for accuracy – AI tools hallucinate facts and should never be used as a source of truth without verification. See also: Generative AI, Hallucination (AI), AI Chatbot, Prompt Engineering.
Checksum / Hash Function
A hash function is a mathematical algorithm that takes data of any size as input and produces a fixed-size output (called a hash, digest, or checksum). The same input always produces the same output; any change to the input – even a single character – produces a completely different hash. This makes hashes extremely useful for: Data integrity verification – after downloading a file, compare its hash to the publisher’s published hash to confirm no corruption or tampering; Password storage – websites store password hashes rather than passwords, so if the database is breached, original passwords are not exposed; Forensic verification – in data recovery and forensics, hash values prove a file or drive image hasn’t been altered; Blockchain – each block’s hash includes the previous block’s hash, creating the immutable chain. Common hash algorithms: MD5 (outdated for security), SHA-256 (widely used), SHA-3. See also: Encryption, Blockchain, Forensic Imaging.
Chipset
A chipset is a set of electronic components on the motherboard that manages the flow of data between the CPU, RAM, storage, and other peripherals. In older computers, the chipset consisted of two chips – the Northbridge (handling fast connections to CPU, RAM, and GPU) and Southbridge (handling slower I/O connections). In modern systems, much of the Northbridge functionality has been integrated directly into the CPU itself (the memory controller, PCIe lanes), with the remaining “Platform Controller Hub” managing USB, SATA, storage, and audio. Chipset choice determines which processors, RAM speeds, and features a motherboard supports. Intel and AMD both produce chipsets paired with their CPU families (e.g., Intel Z890, AMD X870). See also: CPU, Motherboard, PCIe.
CI/CD (Continuous Integration / Continuous Delivery)
CI/CD is a set of development practices and automated pipelines that enable software teams to build, test, and release code changes frequently and reliably. Continuous Integration (CI) means developers merge their code changes into a shared repository frequently (often many times per day), with automated tests running immediately to catch errors quickly. Continuous Delivery (CD) means keeping code in a deployable state at all times; Continuous Deployment goes further, automatically deploying every passing change to production without human intervention. Popular CI/CD platforms include GitHub Actions, GitLab CI/CD, Jenkins, CircleCI, and AWS CodePipeline. CI/CD enables the rapid release cycles seen in modern software – apps updating multiple times per week. See also: Git / Version Control, Containerisation / Docker, Cloud Computing.
Cleanroom (Data Recovery Cleanroom)
A cleanroom is a controlled environment with extremely low levels of airborne particulates (dust, microbes, aerosol particles). In the context of hard drive data recovery, hard drive platters and read/write heads are so sensitive that even a single dust particle landing on a spinning platter can cause catastrophic physical damage (a head crash), destroying data. Opening a hard drive outside a cleanroom in normal air almost guarantees additional damage to already-failing drives. Professional data recovery companies perform physical HDD repairs in cleanrooms rated to our ISO-5 cleanroom data recovery facility (Class 100) or better, where the air contains fewer than 3,520 particles of 0.5 microns or larger per cubic metre. If your hard drive has failed physically, what to do with a failed hard drive. Attempting to open a hard drive yourself outside a cleanroom environment will likely cause irreversible additional damage. See also: Data Recovery, Head Crash, Hard Drive (HDD).
CLI / Terminal / Command Line
The Command Line Interface (CLI) is a text-based interface where users type commands directly to interact with the operating system or software, without the visual buttons and menus of a graphical interface (GUI). On Windows, command-line tools include Command Prompt (cmd.exe) and PowerShell; on macOS and Linux, the Terminal runs a shell (typically Bash or Zsh). CLI tools are preferred by developers, professional IT and server management, and power users because they are: faster for many tasks (one command vs multiple menu clicks); scriptable (commands can be automated in scripts); powerful (many tools only have CLI interfaces); and remote-accessible (SSH into servers). Modern CLI tools include: git (version control), npm/pip (package managers), docker (containers), and curl (web requests). See also: Linux, SSH, Programming Language, Git / Version Control.
Click of Death
The “click of death” describes a specific symptom of a failing hard disk drive (HDD): a rhythmic, repetitive clicking or ticking sound coming from the drive during operation or startup. This sound indicates the read/write head is failing to find the reference track it needs to position itself, repeatedly seeking and resetting in a cycle. The click of death is a serious warning – it typically indicates imminent mechanical failure. Causes include: damaged read/write heads, failed head actuator, platter damage, corrupted firmware, or insufficient power supply. If your hard drive is making clicking sounds: stop using it immediately – see our guide on what to do when your hard drive makes clicking sounds; do not run disk repair tools (this can worsen damage), attempt a backup of essential files if the drive is partially accessible, and contact The Original PC Doctor for professional data recovery as soon as possible. Every additional power-on cycle can cause further physical damage. See also: Data Recovery, Head Crash, Bad Sectors, Cleanroom.
Clipboard
The clipboard is a temporary storage area in your computer’s memory that holds the most recently copied or cut item – text, images, files, or other data – ready to be pasted elsewhere. Basic clipboard operations: Copy (Ctrl+C / Cmd+C) – copies selected content to clipboard, leaving the original in place; Cut (Ctrl+X / Cmd+X) – moves selected content to clipboard, removing it from the original location; Paste (Ctrl+V / Cmd+V) – inserts clipboard content at the cursor position. The clipboard holds only the most recent item by default. Windows 11 has a Clipboard History feature (Win+V) that stores multiple recent copied items. See also: Keyboard Shortcuts, Desktop (UI).
Cloud Gaming / Game Streaming
Cloud gaming (also called game streaming) is a technology that runs video game processing on powerful remote servers and streams the video output to the player’s device in real-time, similar to how Netflix streams video. The player’s inputs (button presses, mouse movements) are sent to the server over the internet and the rendered game video is streamed back, typically at 60fps in 1080p or higher. This means high-quality games can be played on low-powered devices (smartphones, Chromebooks, basic laptops) without expensive gaming hardware. Major cloud gaming services include: Xbox Cloud Gaming (xCloud), NVIDIA GeForce NOW, PlayStation Plus Premium Cloud Streaming, and Amazon Luna. Critical dependency: cloud gaming requires very low-latency, professional NBN and internet setup for gaming (at least 15–25 Mbps and under 40ms latency). See also: Latency, Streaming, GPU, NBN.
Cloud Backup
Cloud backup is the process of automatically copying data (documents, photos, videos, system files) to remote servers hosted on the internet, rather than relying solely on local storage. Services include Backblaze, IDrive, Microsoft OneDrive, Google Drive, Apple iCloud, and Carbonite. The key advantage is that your data is protected even if your physical devices are lost, stolen, destroyed in a fire, or compromised by ransomware. For businesses, cloud backup is critical for disaster recovery – the ability to restore operations quickly after a major data loss event. The 3-2-1 backup rule is the gold standard: keep 3 copies of your data, on 2 different types of media, with 1 copy offsite (cloud). See also: Cloud Computing, Ransomware, NAS, RAID.
Cloud Computing
Cloud computing means accessing computing resources – servers, storage, databases, software, networking, analytics, and AI services – over the internet (“the cloud”) rather than owning and operating physical hardware on-premises. Instead of buying expensive servers, businesses rent capacity from massive data centres operated by companies like Amazon Web Services (AWS), Microsoft Azure, and Google Cloud. The main benefits are: no upfront hardware investment, pay-only-for-what-you-use pricing, instant scalability, global availability, and access to cutting-edge AI and analytics tools. Cloud computing has fundamentally changed how software is delivered (SaaS), how businesses store data, and how AI models are trained and deployed. See also: SaaS / PaaS / IaaS, Cloud Backup, Virtualisation, API.
OneDrive / iCloud / Google Drive (Cloud Sync Services)
The three dominant consumer cloud sync and storage services: Microsoft OneDrive – tightly integrated with Windows 11 and Microsoft 365; 5GB free (1TB included with Microsoft 365 Personal); syncs Desktop, Documents, and Pictures folders automatically; Apple iCloud – seamlessly integrates across iPhone, iPad, and Mac; 5GB free; syncs photos, contacts, calendar, documents, keychain (passwords), app data, and device backups; Google Drive – 15GB free (shared with Gmail and Google Photos); cross-platform (works on Windows, Mac, iOS, Android); integrates with Google Docs, Sheets, and Slides. Key considerations: storage plans, privacy policies, and ecosystem lock-in. All three encrypt data in transit and at rest; however, they are professional data recovery service – if you accidentally delete a file, the deletion syncs to all devices. See also: Cloud Backup, Sync, Cloud Computing.
CMS (Content Management System)
A Content Management System is software that enables users to create, manage, and publish digital content on a website without needing to write HTML or code. The most popular CMS is website and IT services (powers approximately 43% of all websites globally, including thepcdoctor.com.au), which uses themes for visual design and plugins for added functionality. Other popular CMS platforms: Shopify (e-commerce focus); Squarespace and Wix (beginner-friendly hosted solutions); Drupal and Joomla (open-source alternatives to WordPress for complex sites); Webflow (visual design-focused); and Contentful and Sanity (headless CMSs that separate content from presentation). A headless CMS delivers content via API to any frontend – a website, mobile app, smart TV app, or voice assistant – from one backend. See also: HTML / CSS / JavaScript, Web Hosting, SEO.
Codec (Coder-Decoder)
A codec is software (or hardware) that compresses (encodes) and decompresses (decodes) digital audio and video data. Without codecs, video files would be impossibly large – a single minute of uncompressed 4K video would be hundreds of gigabytes. Common video codecs: H.264 (AVC) – the most widely supported standard, used for Blu-ray, streaming, and most online video; H.265 (HEVC) – 50% more efficient than H.264, used for 4K streaming; AV1 – the next-generation open-source codec (used by YouTube, Netflix), even more efficient than H.265. Audio codecs: AAC – standard for streaming and iPhone; MP3 – widely compatible but older; FLAC – lossless compression (perfect quality, larger files); Opus – excellent for voice and music streaming. See also: Streaming, Blu-ray, Lossless vs Lossy Compression.
Monitor Calibration / Colour Management
Monitor calibration is the process of adjusting a display to accurately reproduce colours as they are defined in standard colour spaces, ensuring what you see on screen matches what prints or appears on other calibrated displays. Without calibration, monitors often display colours too warm, cool, saturated, or washed out. Why it matters: photographers who edit with an uncalibrated monitor may produce images that look correct on their screen but appear differently when printed or viewed elsewhere. Graphic designers working on brand colours need consistent reproduction. Calibration hardware: a colorimeter (hardware device placed on the screen) takes precise colour measurements while software adjusts the monitor’s colour profile. Popular: Datacolor Spyder X, X-Rite i1Display. Software-only calibration: Windows and macOS include basic display calibration wizards (search “Calibrate display colour” in Windows; System Settings > Displays > Color Profile in macOS) that adjust gamma and white balance visually. ICC colour profiles are files that describe a device’s colour characteristics; well-designed monitors include profiles on disc or for download. See also: Colour Space, Monitor, RAW Image Format.
Colour Space / Colour Gamut
A colour space defines the range of colours (gamut) that can be represented in a digital image or displayed by a screen. Different colour spaces serve different purposes: sRGB – the standard for the web, Windows, and most consumer content; covers roughly 35% of all visible colours; the baseline most monitors and content are calibrated to. DCI-P3 – the cinema standard; covers 45% of visible colours; more vivid reds and greens; used by iPhone, iPad, and Mac Retina displays; HDR streaming content typically delivered in P3. Adobe RGB – wider than sRGB for professional photo editing and printing; not suitable for web. Rec. 2020 – the ultra-wide standard for HDR video; covers 75% of visible colours; only achievable on high-end displays. When comparing monitors, “99% sRGB” and “95% DCI-P3” coverage are key specs for professional monitor calibration and setup. See also: HDR, OLED, Monitor, RAW Image Format.
File Compression (ZIP / 7-Zip / RAR)
File compression reduces the size of files or folders by encoding data more efficiently. This saves storage space and reduces the time needed to send or download files. Compressed files are often referred to as archives. Common formats: ZIP – the most universally compatible format; supported natively by Windows, macOS, and Linux without additional software; 7-Zip / .7z – free, open-source tool offering superior compression ratios to ZIP; RAR / .rar – proprietary format requiring WinRAR to create (but free tools can extract); popular for splitting large archives across multiple parts; TAR / .tar.gz – common on Linux/macOS for combining files. Compression works best on text files, documents, and databases; already-compressed files (JPEG, MP4, ZIP) compress very little further. See also: File Extension, Lossless vs Lossy Compression.
Computer
A computer is an electronic device that processes data according to instructions (programs) to produce useful output. The main categories include: home and office computer repairs – a full-sized tower or all-in-one unit for home or office use, offering the best performance and upgradeability; Laptop / Notebook – a portable computer with built-in screen, keyboard, and battery; Tablet – a touchscreen device like an iPad or Samsung Galaxy Tab, typically running a mobile operating system; Server – a powerful computer designed to run continuously and provide services to other devices over a network; Mini PC – a compact desktop-replacement (like an Intel NUC or Apple Mac Mini); and Workstation – a high-performance desktop designed for demanding tasks like 3D rendering, video editing, or AI research. See also: CPU, RAM, GPU, Motherboard, SSD.
Blue Light / Digital Eye Strain
Digital eye strain (also called Computer Vision Syndrome) is a group of eye and vision problems resulting from prolonged use of digital screens. Symptoms include: tired or sore eyes; blurred or double vision; headaches; dry eyes; neck and shoulder pain; difficulty focusing. Causes: screens emit blue-wavelength light; unconscious reduced blinking when concentrating (from the normal 15–20 blinks/minute to 5–7); small text requiring sustained focus; screen glare; incorrect viewing distance or angle. The 20-20-20 rule: every 20 minutes, look at something 20 feet (6 metres) away for 20 seconds. Other mitigations: night mode / blue light filter (built into Windows Night Light, macOS Night Shift, iOS/Android Night Mode – reduces blue light emission in evenings); screen brightness matching ambient room light; anti-reflective monitor coating; viewing distance of 50–70cm; monitor positioned at or slightly below eye level. Blue light glasses (computer glasses with blue light filtering lenses) have limited scientific evidence for reducing eye strain but many users report benefit. Regular eye examinations are important for screen workers. See also: Monitor, Dark Mode, Ergonomic Accessories.
Computer Insurance / Accidental Damage Cover
Standard home and contents insurance policies vary significantly in how they cover computers and technology. Key coverage types: Accidental damage cover – covers spills, drops, accidental breakage; usually requires a specific “portable valuables” or “accidental damage” rider; not included in basic policies. Theft cover – most home policies cover computers stolen from your home; coverage of devices stolen from a car or in public may require additional portable contents cover. Power surge damage – some policies cover electrical damage; others exclude it or require proof of a grid event. Data loss – almost never covered by standard insurance. Dedicated computer or gadget insurance (Allianz, Budget Direct, Woolworths Insurance add-ons) can cover: accidental damage, liquid damage, theft (at home and away), breakdown after manufacturer warranty expires, and accessories. Before making a claim, computer insurance assessment reports report specifying repair costs vs replacement value. Keep receipts and serial numbers of valuable devices. See also: Computer, Laptop Repairs, Data Recovery.
Computer Maintenance Schedule
Regular maintenance dramatically extends computer life and prevents problems. A practical schedule: Weekly: restart your computer (clears memory, applies updates); empty Recycle Bin; delete browser temporary files (Ctrl+Shift+Delete in most browsers). Monthly: check for and install Windows/macOS updates; run a full antivirus scan; review startup programs and disable unnecessary ones (Task Manager > Startup); check storage space (keep at least 10–15% free); review and uninstall unused programs. Every 3–6 months: clean keyboard and screen (compressed air, microfibre cloth); blow dust from vents, particularly laptop vents (use compressed air – restricted airflow is the leading cause of overheating); check hard drive health via SMART tools; review and clear browser history, cookies, and extensions; test that backups are working and restoring. professional computer maintenance service: reapply thermal paste (especially laptops 3+ years old); deep clean desktop tower internals; review software licences; consider hardware upgrades (RAM, SSD). See also: Thermal Paste, Thermal Throttling, Slow Computer Causes, Windows Updates.
Computer Won’t Turn On / Won’t Start – Troubleshooting
When a computer fails to start, the cause narrows based on what symptoms you observe: Nothing happens at all (no lights, no fan noise) – power supply failure; check power cable is firmly connected; test wall socket with another device; desktop PSU failure is common; laptop power adapter failure. Fans spin but no display – RAM may have become unseated; try reseating RAM sticks; GPU failure; monitor connection issue (try different cable/port). Power light on but black screen – check monitor input source; try external monitor on laptop. Starts then turns off immediately – typically overheating protection (heat paste dried out) or PSU failure. Beep codes on startup – different BIOS beep patterns indicate specific hardware failures (RAM, GPU, motherboard). Gets to Windows logo then crashes – Windows file corruption; boot from Windows USB and run professional computer repair service. Blue screen on startup loop – driver corruption or hardware failure; boot into Safe Mode; run sfc /scannow. Mac with folder icon or question mark – hard drive not found; data recovery from failed drives. See also: BSOD, Safe Mode, Bootable USB, Data Recovery, PSU.
Gaming Console
A gaming console is a dedicated electronic device designed primarily for playing video games, connecting to a TV or monitor and (in modern generations) to the internet. Current generation consoles: Sony PlayStation 5 (PS5) – features a custom AMD CPU/GPU, ultra-fast NVMe SSD, 3D audio, and haptic feedback DualSense controller; plays games in up to 8K and 120fps at 4K. Microsoft Xbox Series X/S – the Series X is the most powerful console ever made by Microsoft; the Series S is smaller and disc-less. Nintendo Switch (OLED) – a hybrid console/handheld with detachable controllers. Consoles compete with PC gaming: consoles offer simplicity, exclusive games, and fixed hardware; PCs offer upgrade potential, modding, higher frame rates, and broader game libraries. See also: GPU, HDMI, Cloud Gaming.
Containerisation / Docker
Containerisation is a software technology that packages an application and all its dependencies (code, libraries, configuration files, runtime environment) into a single portable unit called a “container.” Containers run consistently across different computing environments – a containerised app works identically on a developer’s laptop, a test server, and a production cloud environment. Docker is the most popular containerisation platform. Kubernetes (K8s) is an orchestration system for managing large numbers of containers across a cluster of servers, handling automatic scaling, load balancing, and recovery. Containerisation is now the standard way businesses deploy cloud-native applications. See also: Cloud Computing, Virtualisation, Server.
Context Menu / Right-Click Menu
A context menu (also called a right-click menu or shortcut menu) is a pop-up list of relevant actions that appears when you right-click (or press and hold on a touchscreen) on an item – a file, folder, desktop, image, or text. The menu shows options relevant to what you clicked on. For example, right-clicking a file gives you options to Open, Copy, Cut, Delete, Rename, or view Properties. Right-clicking selected text in a document shows options to Copy, Cut, Format, or Translate. The context menu is one of the most useful and underused features of modern computers – if you are unsure what you can do with something, right-clicking it will show you the possibilities. See also: Desktop (UI), File and Folder.
CGM (Continuous Glucose Monitor)
A Continuous Glucose Monitor is a wearable medical device that measures blood glucose levels in real time, continuously, through a small sensor inserted just under the skin (typically on the arm or abdomen). Unlike traditional finger-prick testing (which gives a single reading), CGMs provide readings every 1–5 minutes and trend arrows showing whether glucose is rising or falling. CGMs connect to smartphone apps or dedicated receivers, enabling: real-time glucose alerts (high or low); trend analysis; insulin dosing assistance; and integration with automated insulin delivery systems (the “artificial pancreas”). In Australia, CGMs are subsidised through the NDSS (National Diabetes Services Scheme) for Type 1 diabetics and qualifying Type 2 patients. Leading brands include Dexcom, Freestyle Libre (Abbott), and Medtronic. See also: Wearable Technology, Biometrics, IoT, Telehealth.
Control Panel / Settings
The Control Panel (Windows 7/8/10) and Settings app (Windows 10/11) are the central hubs for configuring your computer – adjusting display settings, changing network connections, managing user accounts, setting up printers, configuring Windows Update, managing privacy settings, and much more. In Windows 11, most settings have moved into the Settings app (Win+I), which has a cleaner interface. Some advanced settings are still found in the legacy Control Panel. On Mac, the equivalent is System Settings (previously System Preferences). Learning to navigate Settings/Control Panel is fundamental to managing your own computer. See also: Operating System, User Account, Driver.
Cookie (Web Cookie)
A web cookie is a small text file that a website stores in your browser to remember information about you and your visit. Cookies have several uses: Session cookies keep you logged in as you navigate a website; Preference cookies remember your settings (language, location); Analytics cookies track how visitors use a website (Google Analytics); Advertising/tracking cookies follow you across websites to build a profile for targeted advertising. Under Australian and international privacy regulations, websites must inform users about cookies and obtain consent for non-essential ones. You can view, manage, and delete cookies in your browser settings. See also: Browser, Private Browsing, Metadata.
Computer Cooling Types
Computers generate heat that must be removed to prevent thermal throttling or damage. Cooling solutions from simplest to most advanced: Passive cooling – heatsinks with no fans; silent; used for low-power chips and some mini PCs; limited thermal capacity. Air cooling – heatsink with one or more fans to move hot air away from the chip; cost-effective; reliable; most common for CPUs and GPUs. AIO liquid cooling – closed-loop all-in-one cooler with pump, tubes, and radiator; quieter than large air coolers; better aesthetics; 120mm, 240mm, 360mm radiator sizes. Custom water loops – enthusiast-grade; multiple components cooled; maximum performance; requires maintenance. Phase-change cooling – like a refrigerator compressor; extreme overclocking only. Immersion cooling – servers submerged in dielectric fluid; data centre use. See also: Thermal Throttling, Thermal Paste, Liquid Cooling, Overclocking.
Microsoft Copilot
Microsoft Copilot is Microsoft’s suite of AI-powered assistants embedded throughout Microsoft 365 products. It uses large language models (primarily GPT-4) combined with your organisation’s data (via Microsoft Graph) to assist with productivity tasks. Copilot in Word – drafts documents, summarises long reports, rewrites content in different tones. Copilot in Excel – analyses data, creates formulas, builds charts, and answers questions about your spreadsheet data in plain English. Copilot in Outlook – drafts and replies to emails, summarises long email threads, prepares meeting briefings. Copilot in Teams – summarises meeting discussions, captures action items, answers questions about what was discussed. Copilot in PowerPoint – creates presentations from a brief or document. Microsoft Copilot (web) – a standalone ChatGPT-like assistant at copilot.microsoft.com; free with a Microsoft account. Copilot for Microsoft 365 (enterprise version with data access) requires a Microsoft 365 Business or Enterprise subscription plus an additional per-user monthly fee. See also: Generative AI, Large Language Model (LLM), AI Chatbot, Microsoft 365.
Copy, Cut, and Paste
Copy, Cut, and Paste are the fundamental operations for moving and duplicating content in computing. Copy (Ctrl+C) duplicates the selected content and places it on the clipboard while leaving the original untouched. Cut (Ctrl+X) moves the selected content to the clipboard, removing it from its current location. Paste (Ctrl+V) inserts the clipboard content at the cursor location or selected destination. These operations work across almost all applications – you can copy text from a website and paste it into a Word document; copy a file in File Explorer and paste it into a folder; or copy an image and paste it into an email. On Mac, replace Ctrl with the Command (⌘) key. See also: Clipboard, Keyboard Shortcuts.
Corrupt File / File Corruption
A file becomes corrupt when its data is damaged, incomplete, or internally inconsistent – making it partially or completely unreadable. File corruption can occur due to: interrupted writes (e.g., removing a USB drive without safely ejecting, power loss during saving); bad sectors on the storage device; software bugs during file creation or editing; malware damage; file system errors; hardware failure; incomplete downloads; or media degradation. Symptoms include: error messages when opening a file (“The file is corrupt and cannot be opened”), files with 0KB size, garbled or missing content when opened, and programs crashing when attempting to load the file. Some corrupt files can be repaired with specialised software (e.g., Stellar Repair for Excel/Word/Video); others may need our professional data recovery service. See also: Bad Sectors, Data Recovery, File System.
CPU (Central Processing Unit)
The CPU is the brain of the computer; it handles the majority of calculations and processing that make your computer work. The faster your CPU, the quicker programs open and the more tasks your computer can handle simultaneously. Modern CPUs contain multiple “cores” – essentially independent processors on a single chip. A quad-core handles four tasks at once; an octa-core handles eight; modern consumer CPUs now range from 8 to 24 cores. CPUs also contain a cache (small, fast on-chip memory), an integrated GPU (for basic graphics without a separate GPU), and increasingly an NPU for AI workloads. Leading CPU manufacturers include Intel (Core Ultra, Core i-series), AMD (Ryzen), Apple (M-series), and Qualcomm (Snapdragon X for Windows laptops). See also: GPU, RAM, Motherboard, Multi-Core Processor, AI Computing.
Crash / Freeze / Hang
A computer crash is when a program or the entire system stops responding or terminates unexpectedly. Types: Program crash – a single application stops responding (“Not Responding” in the title bar) or closes suddenly; use Task Manager (Ctrl+Shift+Esc) to force-close it; System freeze/hang – the entire computer becomes unresponsive; mouse and keyboard inputs are ignored; may require a forced restart (hold the power button); BSOD (Blue Screen of Death) – Windows displays a blue screen with an error code and restarts; this indicates a serious hardware or driver problem. Common crash causes include insufficient RAM, overheating, failing hard drives, corrupted drivers, malware, and software bugs. If crashes happen frequently, professional computer repair service. See also: Task Manager, RAM, Thermal Throttling, Driver.
CRM (Customer Relationship Management)
A CRM is software that manages a company’s interactions and relationships with current and potential customers, centralising contact information, communication history, sales opportunities, support tickets, and marketing activities in one accessible system. CRMs help businesses: track leads through the sales pipeline; remember customer preferences and history; manage follow-up tasks and appointments; automate marketing emails; and analyse sales performance. Popular CRM platforms include Salesforce (the global leader for large enterprises), HubSpot (popular for small-medium businesses, free tier available), Zoho CRM, Pipedrive, and Microsoft Dynamics 365. For small Australian trades businesses, simpler tools like business IT and software setup or Tradify combine CRM with job management. See also: SaaS, Cloud Computing, Database.
CRT (Cathode-Ray Tube)
Invented in 1897, the CRT display uses an electron beam that scans across a phosphor-coated screen, causing it to glow and form images. CRT monitors and televisions were the standard display technology for most of the 20th century until being largely replaced by LCD flat-panel displays in the mid-2000s. CRTs are now considered obsolete for practical use but are sought after by retro gaming enthusiasts for their specific display characteristics (no input lag, natural motion blur, visible scan lines). See also: LCD, OLED, Monitor.
Cryptocurrency Wallet
A cryptocurrency wallet stores the cryptographic keys (not the coins themselves – those exist on the blockchain) needed to access and transfer cryptocurrency. Types: Hot wallets – connected to the internet; convenient for regular trading; higher security risk. Software hot wallets: exchange wallets (Coinspot, Binance – most convenient but custodial: the exchange holds your keys; if the exchange is hacked or collapses, you may lose funds); desktop wallets (Exodus, Electrum); mobile wallets (Trust Wallet, MetaMask mobile). Cold wallets (hardware wallets) – offline physical devices storing keys securely (Ledger, Trezor); the safest storage for significant cryptocurrency holdings; connects to a computer only when making transactions. Key principle: “Not your keys, not your coins” – if you don’t control the private keys, you don’t truly own the crypto. Recovery phrase (seed phrase): a 12–24 word backup phrase that can restore a wallet; protect this like the most important password you own; never store digitally; never share it; someone with your seed phrase owns everything in your wallet. See also: Cryptocurrency, Blockchain, Investment Scam.
Cryptocurrency
Cryptocurrency is a digital form of currency that uses cryptography to secure transactions and control the creation of new units, operating on decentralised blockchain networks without a central bank or single authority. Bitcoin (BTC), created in 2009, was the first cryptocurrency. Others include Ethereum (ETH), which supports smart contracts and decentralised applications; Solana, Litecoin, Ripple (XRP), and thousands more. Cryptocurrency can be bought and sold on exchanges (CoinSpot and CoinJar are popular Australian options), used for online transactions, or held as a speculative investment. Important considerations: crypto investments carry significant risk due to extreme price volatility; exchanges and wallets can be hacked; and the Australian Tax Office (ATO) treats cryptocurrency as an asset subject to Capital Gains Tax. See also: Blockchain, NFT, Encryption.
Cursor / Mouse Pointer
The cursor (or mouse pointer) is the arrow (or other shape) on screen that moves when you move your mouse, trackpad, or touchpad, indicating where your next click or action will take effect. The cursor changes shape depending on context: an arrow for general navigation; an I-beam (text cursor) when over editable text; a hand when hovering over a clickable link; a spinning circle when the computer is loading; a four-headed arrow when resizing a window; and a crosshair in graphic design software. A separate text cursor (blinking vertical line, also called a caret or insertion point) shows where text you type will appear in a document or text field. See also: Mouse, Touchpad / Trackpad.
CVE (Common Vulnerabilities and Exposures)
CVE is a public catalogue of known cybersecurity vulnerabilities, maintained by MITRE Corporation and sponsored by the US Department of Homeland Security. Each vulnerability is assigned a unique CVE identifier (e.g., CVE-2021-44228 for the log4j vulnerability), a description, and a CVSS (Common Vulnerability Scoring System) score from 0–10 indicating severity (10 = most critical). When a security researcher or vendor discovers a vulnerability, it is reported through a coordinated disclosure process and assigned a CVE. System administrators, patch management tools, and vulnerability scanners use CVE IDs to identify, track, and prioritise patching. The CVSS score considers: exploitability (how easy is it to exploit?); impact (confidentiality, integrity, availability); and scope. professional vulnerability management (nvd.nist.gov, cve.mitre.org) is essential for any organisation managing IT systems. See also: Patch Management, Zero-Day Vulnerability, Cybersecurity.
Cybersecurity
Cybersecurity encompasses the practices, technologies, and processes designed to protect computers, networks, programs, and data from unauthorised access, damage, theft, and attack. With remote work, cloud services, and AI-driven threats now mainstream, cybersecurity is critical for organisations and individuals of all sizes. Core cybersecurity practices include: keeping software and operating systems updated; using strong, unique passwords with a password manager; enabling Multi-Factor Authentication (MFA) on all accounts; installing reputable security software; backing up data using the our home and office computer repair services; training staff to recognise phishing; and applying the principle of least privilege (users only have access to what they need). In Australia, the professional virus and cybersecurity services (ACSC) at cyber.gov.au provides free guidance for businesses and individuals. See also: Ransomware, Phishing, VPN, Multi-Factor Authentication (MFA), Firewall, Zero Trust Security.
DAC / Audio Interface
A DAC (Digital-to-Analogue Converter) converts digital audio signals (the 0s and 1s stored in digital files or streaming) into analogue electrical signals that drive speakers or headphones. Every device that plays audio has a DAC – your phone, laptop, and TV all have built-in DACs. A dedicated external DAC (connected via USB) provides higher quality conversion with less electrical interference, benefiting audiophiles using high-quality headphones or speakers. An audio interface combines a DAC, ADC (Analogue-to-Digital Converter), microphone preamp, and headphone amplifier in one unit. Audio interfaces (from brands like Focusrite, Universal Audio, MOTU) are used by musicians, podcasters, and streamers for professional-quality recording and monitoring. See also: USB, Headphones / Headset, Microphone.
Dark Mode
Dark mode is a display option that switches the colour scheme of an interface from the traditional light background with dark text to a dark background with light text. Most operating systems (Windows 11, macOS, Android, iOS), apps, and websites now offer dark mode. Benefits: reduces eye strain in low-light environments; can extend battery life on OLED displays (dark pixels are turned off, consuming no power); and is preferred aesthetically by many users – particularly developers and those who spend long hours at screens. To enable on Windows 11: Settings > Personalisation > Colors > Dark. On macOS: System Settings > Appearance > Dark. On iPhone: Settings > Display & Brightness > Dark. Many browsers support automatic dark mode that applies to websites using CSS media queries. See also: OLED, Battery, Control Panel / Settings.
Dark Web
The internet has three layers: the Surface Web (websites indexed by search engines like Google, representing a small fraction of total internet content); the Deep Web (content not indexed by search engines – bank accounts, email inboxes, medical records, subscription content); and the Dark Web (a hidden part of the internet only accessible through specialised software like the Tor browser, which anonymises traffic by routing it through multiple encrypted nodes). The dark web is home to both legitimate uses (journalists communicating with sources in repressive regimes, privacy-conscious individuals) and significant criminal activity (stolen data marketplaces, illegal drug sales, hacking services). If your personal data is compromised in a data breach, it may end up for sale on dark web marketplaces. Services like Have I Been Pwned (get professional help securing your accounts) can check if your email has appeared in known data breaches. See also: Data Breach, Cybersecurity, VPN, Encryption.
Data Breach
A data breach occurs when unauthorised individuals gain access to confidential, sensitive, or protected data. This can include customer names, email addresses, passwords, credit card numbers, medical records, or government IDs. Breaches occur through hacking, phishing attacks, insider threats, lost devices, or poorly secured systems. High-profile Australian data breaches in recent years include Medibank Private (2022, 9.7 million customers’ health data exposed), Optus (2022, up to 9.8 million customer records), and Latitude Financial (2023). Under Australia’s Notifiable Data Breaches (NDB) scheme, organisations must notify the Office of the Australian Information Commissioner (OAIC) and affected individuals when a breach is likely to cause serious harm. If you believe your data was in a breach, expert help securing your system after a breach, enable MFA, and monitor your accounts for unusual activity. See also: Cybersecurity, Phishing, Ransomware, Multi-Factor Authentication (MFA).
Data Broker
A data broker (also called an information broker or data reseller) is a company that collects personal information about individuals from various public and private sources – social media, public records, purchase histories, location data from apps, court records, voter rolls, loyalty programmes – aggregates and analyses it, then sells or licenses the resulting profiles to third parties. Data broker profiles can include: full name, address history, family members, phone numbers, email addresses, financial indicators, political preferences, health interests, and predicted behaviours. Buyers include: marketers (targeted advertising), employers (background checks), insurers, financial institutions, and occasionally law enforcement. In Australia, some data broker activities are regulated under the Privacy Act, but the industry remains largely opaque. You can request data removal from major brokers (Acxiom, LexisNexis, Equifax) though the process is tedious. See also: Digital Footprint, Privacy Act, GDPR / International Privacy Law.
Data Carving
Data carving is a data recovery technique that searches raw disk data (a sector-by-sector copy) for recognisable file signatures – the specific patterns of bytes that identify the beginning and end of known file types – to reconstruct files without relying on the file system. This is used when the file system itself is damaged or destroyed (formatted drives, corrupted partition tables, ransomware), but the underlying data sectors still contain file content. Data carving software (such as PhotoRec, Autopsy, X-Ways, and Recuva) scans through raw disk data looking for JPEG headers, PDF structure markers, Word document patterns, and hundreds of other file type signatures. While very powerful, data carving cannot recover original filenames or folder structure – recovered files are typically saved with generic numbered names. See also: File System, Disk Image, Data Recovery, Forensic Imaging.
Data Loss – Common Causes
Understanding the most common causes of data loss helps with both prevention and recovery planning: Accidental deletion – the most common cause; files deleted (and Recycle Bin emptied) or a drive reformatted accidentally. Hardware failure – hard drive mechanical failure (bearing failure, head crash), SSD controller failure, failed RAID drives, power surge damage. Software/OS corruption – operating system crashes, software bugs, interrupted updates, corrupted file systems. Ransomware / Malware – encrypting or destroying files. Physical damage – dropping a laptop with a spinning HDD, water or fire damage, electrical damage. Human error – overwriting files, incorrect formatting, failed drive swaps. Theft – device stolen without backup. Natural disaster – fire, flood, lightning strike. The our data recovery services (3 copies, 2 media types, 1 offsite) protects against all these scenarios. See also: Cloud Backup, RAID, Ransomware, Physical Failure, Logical Failure.
Data Recovery
Data recovery is the process of attempting to retrieve data from a storage device (hard drive, SSD, USB drive, memory card, NAS, RAID array, tape, or mobile device) that can no longer be accessed normally due to: accidental deletion, formatting, partition loss, file system corruption, operating system failure, mechanical damage (HDD), electronic component failure, natural disaster (fire, flood), or ransomware encryption. Data recovery is not guaranteed – success depends on the type of failure, how long the drive has been used since data loss occurred, whether the device has been written to, and the physical condition of the device. Key rule: stop using the device immediately upon data loss – read our guide on what to do when your hard drive fails. Every additional write to the storage device can overwrite the very data you are trying to recover. In Australia, The Original PC Doctor’s professional data recovery service can recover data from a wide range of failure scenarios. See also: Backup vs Data Recovery, Logical Failure, Physical Failure, Disk Image, Cloud Backup.
Data Sovereignty / Data Residency
Data sovereignty refers to the principle that digital data is subject to the laws and governance of the country in which it is stored or processed. Data residency refers to the physical location where data is stored. These concepts are critically important for: Australian government data (must remain in Australia under government ICT policies); healthcare data (subject to Australian Privacy Act requirements); financial data; and data about Australian citizens. When choosing cloud services, Australian data sovereignty and IT advice where their data is stored – “Asia-Pacific” region could mean Singapore, Japan, or Sydney. Major cloud providers (AWS, Azure, Google Cloud) all have Sydney and Melbourne data centres. Some international cloud services store data in the US by default, which subjects it to US laws (including CLOUD Act demands). See also: Cloud Computing, Privacy Act, Cybersecurity.
Database / SQL / NoSQL
A database is an organised, structured collection of data stored and accessed electronically. Databases are the backbone of virtually every digital system – websites, apps, banks, hospitals, and government services all rely on databases. SQL (Structured Query Language) databases store data in structured tables with rows and columns, using relationships between tables for complex queries. Examples: MySQL, PostgreSQL, Microsoft SQL Server, SQLite. NoSQL databases use flexible data models (document, key-value, graph, column-family) suited to unstructured or rapidly changing data. Examples: MongoDB (documents), Redis (key-value), Cassandra (column-family). A database management system (DBMS) is the software that creates, manages, and provides access to a database. For businesses, professional data recovery service – database corruption or loss is catastrophic. See also: Cloud Computing, Server, Data Recovery.
DAW (Digital Audio Workstation) / Audio Production
A Digital Audio Workstation is software for recording, editing, mixing, and producing audio – used by musicians, podcasters, voice-over artists, sound designers, and broadcast professionals. Key DAW features: multitrack recording; MIDI sequencing (programming virtual instruments); audio effects plugins (EQ, compression, reverb); virtual instruments (synthesisers, samplers); automation; and audio export. Popular DAWs: GarageBand (Mac/iOS – free, excellent for beginners, comes with Apple devices); Logic Pro (Mac – professional, one-time purchase, used by many commercial producers); Ableton Live (popular for electronic music and live performance); FL Studio (popular for hip-hop and electronic music); Pro Tools (industry standard for professional recording studios); Adobe Audition (broadcast audio editing); Audacity (free, cross-platform, good for basic editing and podcasting). Podcast production specifically: record with a USB microphone; edit in Audacity or GarageBand; export as MP3; host on a podcast platform (Buzzsprout, Anchor/Spotify, Libsyn). See also: DAC / Audio Interface, Microphone, Podcast / RSS.
DDoS Attack (Distributed Denial of Service)
A Distributed Denial of Service attack overwhelms a website, server, or network with enormous volumes of traffic from thousands or millions of compromised computers (a botnet) simultaneously, making the target unreachable to legitimate users. Unlike a regular DoS attack from one source (easily blocked), a DDoS attack comes from countless IPs worldwide. Types: Volumetric attacks (saturating bandwidth with traffic); Protocol attacks (exploiting network protocol weaknesses); Application layer attacks (targeting web servers with HTTP requests). DDoS attacks are used by: criminal groups extorting businesses; hacktivists targeting organisations they oppose; nation-state actors disrupting services; and competitors engaging in illegal sabotage. Protection includes: business cybersecurity and IT services (Cloudflare, Akamai absorb attack traffic at their edge networks) and ISP-level scrubbing services. See also: WAF, Firewall, CDN, Cybersecurity.
Deep Learning
Deep learning is a subset of machine learning that uses artificial neural networks with many layers (“deep” networks) to analyse data and extract complex patterns. Deep learning is the technology behind most of the impressive AI capabilities seen today: image recognition (identifying objects in photos), speech recognition (Siri, Google Assistant), natural language processing (ChatGPT, Google Translate), and generating realistic images, video, and text. Deep learning models require enormous training datasets and significant GPU computing power. The breakthrough in deep learning began around 2012 and has accelerated rapidly, powering everything from cancer detection in medical imaging to autonomous vehicle navigation. See also: Artificial Intelligence, Machine Learning, Neural Network, GPU.
Deepfake
A deepfake is synthetic media – typically video, audio, or images – that has been generated or manipulated using deep learning AI to convincingly replace or alter a person’s likeness or voice. The term combines “deep learning” and “fake.” Deepfake technology can create realistic videos of people saying things they never said, clone voices to impersonate individuals in phone calls, or generate entirely fabricated images of real people. While deepfakes have creative and entertainment applications, they pose serious risks: political disinformation, non-consensual intimate imagery (a form of abuse), identity fraud, and “vishing” scams where criminals use voice cloning to impersonate executives and authorise fraudulent transactions (known as Business Email Compromise – learn how to protect your business from scams). Detecting deepfakes is an active area of research. See also: Generative AI, Cybersecurity, Phishing.
Default Settings
Default settings are the pre-configured values that a program, device, or operating system uses out of the box before the user makes any changes. When you “restore to factory defaults” or “reset to default settings,” you are returning all settings to the state they were in when the device or software was first installed. Defaults are designed to work for most users in most situations. If you have changed settings and something is not working correctly, resetting to defaults is often a useful first troubleshooting step. Common examples: browsers have a default search engine (Google in Chrome); Word documents have a default font (Calibri 11pt in newer versions); printers have a default paper size (A4 in Australia). See also: Factory Reset, Control Panel / Settings.
Degausser / Data Destruction
A degausser is a device that applies a powerful magnetic field to a hard drive or magnetic tape, randomising the magnetic domains and erasing all stored data. Degaussing is an approved method of secure data destruction for magnetic HDDs and tape media, used by government agencies and security-conscious organisations. Important limitations: degaussing permanently destroys the drive (it cannot be reused), and it does not work on SSDs, USB flash drives, or other non-magnetic storage. For secure disposal of SSDs and flash storage, the approved method is ATA Secure Erase (a built-in drive command) or physical destruction (shredding). For everyday users disposing of old PCs, Windows’ reset function with the “Remove everything and clean the drive” option provides sufficient protection. Always wipe storage devices secure data erasure service. See also: Data Recovery, SSD, E-Waste, Encryption.
Dependency / Package Manager
Modern software is rarely written from scratch – it relies on hundreds of third-party libraries and packages (dependencies) that provide pre-built functionality. A package manager automates the download, installation, version management, and updating of these dependencies. Common package managers: npm (Node.js / JavaScript – manages packages from the npm registry); pip (Python); composer (PHP – used by WordPress plugin development); maven/gradle (Java); apt/yum (Linux system packages); Homebrew (macOS). A dependency tree shows all direct and transitive dependencies; dependency hell occurs when conflicting version requirements make it impossible to satisfy all dependencies simultaneously. Software supply chain attacks (like the log4j vulnerability) exploit widely-used dependencies to reach thousands of downstream applications. See also: Open Source Software, Supply Chain Attack, Programming Language.
Desktop (The Screen You See)
In computing, the “desktop” refers to the main graphical workspace on your computer screen that appears after you log in – not the physical desk where your computer sits. The desktop displays your wallpaper (background image), icons (clickable shortcuts to programs and files), and the taskbar (usually along the bottom in Windows, at the bottom in macOS). You can right-click the desktop to change the wallpaper, create new folders, or adjust display settings. The desktop is your starting point for everything else – opening programs, accessing files, and launching the Start Menu (Windows) or Dock (Mac). Keeping the desktop tidy with organised folders rather than dozens of scattered icons improves performance and makes finding files easier. See also: Taskbar, Icon, File and Folder, Shortcut.
Development Environment / Local Dev
A development environment is the collection of tools, software, configuration, and infrastructure a developer uses to write, test, and debug code on their local machine before deploying to a production server. Components typically include: a code editor or IDE; a local web server or application runtime (Node.js, Python, PHP); a local database; version control (Git); package managers (npm, pip, composer); and environment configuration files. Local development enables developers to make and test changes without affecting live users. Tools like Docker allow developers to define their entire development environment in code (docker-compose.yml), ensuring everyone on the team has an identical setup. Environment variables store sensitive configuration (API keys, database passwords) outside the codebase. See also: IDE, Git / Version Control, Containerisation / Docker, Database.
DevOps
DevOps is a cultural philosophy and set of practices that combines software development (Dev) and IT operations (Ops), breaking down silos between teams to enable faster, more reliable software delivery. The DevOps approach emphasises: automation of manual processes (CI/CD pipelines, infrastructure as code); monitoring and observability of production systems; rapid iteration with feedback loops; shared responsibility for reliability; and blameless post-mortems when incidents occur. DevOps emerged in response to the traditional model where development teams wrote code and “threw it over the wall” to operations teams to deploy and maintain. The DevOps movement also gave rise to SRE (Site Reliability Engineering), pioneered by Google. See also: CI/CD, Containerisation / Docker, Cloud Computing, Server.
DHCP (Dynamic Host Configuration Protocol)
DHCP is a network protocol that automatically assigns IP addresses and other network configuration (subnet mask, default gateway, DNS server addresses) to devices joining a network – eliminating the need to manually configure each device. When your laptop connects to Wi-Fi, it sends a DHCP discovery broadcast; the router’s DHCP server responds with an available IP address, lease duration, and network settings. DHCP leases are temporary – devices must periodically renew them. DHCP reservations (also called static DHCP leases) configure the router to always assign the same IP address to a specific device based on its MAC address, providing predictability for printers, servers, and cameras without fully manual static IP configuration. If you get an IP address starting with Wi-Fi and network troubleshooting guide, your device failed to get a DHCP lease and assigned itself an Automatic Private IP Address (APIPA). See also: IP Addressing, Router, MAC Address.
Dial-up Internet
Dial-up Internet connected users to the internet using a standard copper telephone line, converting digital data into audio tones transmitted over the voice network. It was very slow (maximum 56 Kbps), blocked the phone line while in use, and required an audible modem handshake to establish a connection. The Australian dial-up network has been shut down entirely following the decommissioning of the PSTN copper network. If you encounter an old computer still configured for dial-up, it will not be able to connect to the internet. See also: NBN, Broadband, ADSL, Modem.
Diffusion Model
A diffusion model is a type of AI generative model that learns to create images (or audio, video, or other data) by learning to gradually reverse a process of adding random noise. During training, images are progressively corrupted with noise until they become pure noise; the model learns to reverse this process – “denoising” noise back into a coherent image. At inference time, starting from pure noise and iteratively applying the learned denoising, the model generates realistic images. Diffusion models power the most capable image generation AI: Stable Diffusion, DALL·E 3, Midjourney, and Adobe Firefly all use diffusion architectures. They excel at photorealistic images, artistic styles, and detailed illustrations. The same principle applies to audio (music generation), video (Sora), and 3D generation. See also: Generative AI, GPU, Deep Learning.
Digital Footprint
Your digital footprint is the trail of data you leave behind through your online activities – deliberately or passively. Active digital footprint: information you intentionally share – social media posts, form submissions, blog comments, uploaded photos, and emails. Passive digital footprint: data collected without your direct input – browsing history tracked by cookies, IP address logs, location data from apps, search history, purchase behaviour, and device usage patterns. Your digital footprint is used by: advertisers (targeted ads based on browsing behaviour); employers (background checks via social media); schools and universities (admissions consideration); insurers; and in some cases, law enforcement. In Australia, you have rights under the privacy and data security services to access and correct data organisations hold about you. See also: Cookie, Metadata, Privacy, VPN.
Digital ID (Australia)
Australia’s Digital ID system (myID, formerly myGovID) is a government-backed digital identity credential that allows Australians to prove who they are online without presenting physical documents. myID is a smartphone app that verifies your identity by cross-referencing your Australian passport, driver’s licence, or Medicare card with government records, and creates a verified digital identity. This digital credential is used to access government services online (ATO, Centrelink) without needing to visit in person. As of 2024, the Australian Government passed the Digital ID Act 2024, creating a framework to accredit private-sector Digital ID providers. Digital ID is different from passwords – it proves your real-world identity online. Uptake is growing as more government services require stronger identity verification. See also: myGov, Biometrics, Multi-Factor Authentication.
Digital Literacy
Digital literacy refers to the knowledge, skills, and behaviours required to effectively and safely use digital technologies. It encompasses a spectrum from basic computer operation (how to use a mouse, send an email, browse the internet) through to more advanced skills (evaluating online information credibility, understanding privacy settings, recognising scams, and using cloud services). Low digital literacy is a growing concern in Australia – as government services, healthcare, banking, and social connection increasingly move online, those without digital skills face significant disadvantage. Key aspects of digital literacy include: using devices and software; finding and evaluating information online; communicating digitally; online safety and security; and understanding data and privacy. The Be Connected program (friendly computer help for all skill levels) is an Australian government initiative to improve digital literacy among older Australians. See also: Hardware vs Software, Cybersecurity, Phishing.
Digital Photography Basics
Understanding key digital photography concepts helps both in choosing a camera and getting the most from it: Megapixel (MP) – one megapixel = one million pixels; determines the maximum print size and crop flexibility; 12MP is sufficient for most uses; 24–50MP is for professional printing and cropping. Sensor size – the physical size of the image sensor; larger sensors capture more light, producing better low-light performance: Full Frame (35mm) > APS-C (crop sensor) > Micro Four Thirds > smartphone sensor. ISO – the sensor’s sensitivity to light; higher ISO enables shooting in dark conditions but introduces digital noise (grain). Aperture (f-stop) – controls depth of field (how much of the image is in sharp focus) and light intake; smaller f-number (f/1.8) = wider aperture = blurry background (bokeh). Shutter speed – controls motion blur; faster speeds freeze action. File formats: JPEG (processed, small file) vs RAW (unprocessed, maximum editing flexibility). photo and data recovery service – photos are often irreplaceable. See also: RAW Image Format, Cloud Backup, Cloud Sync.
Digital Signature / Code Signing
A digital signature is a cryptographic mechanism that proves the authenticity and integrity of a digital document, message, or file – verifying both who created it and that it has not been altered since being signed. Digital signatures use asymmetric cryptography: the signer uses their private key to create the signature; recipients verify it with the corresponding public key. Applications: Email signing (S/MIME, PGP) – proves an email genuinely came from the stated sender; Code signing – software publishers sign their applications, and Windows/macOS warn users before running unsigned code; Document signing – professional IT and digital services on contracts and forms (Adobe Sign, DocuSign); SSL/TLS certificates – websites’ identities are verified by digital certificates. In Australia, the Electronic Transactions Act 1999 grants digital signatures legal equivalence to handwritten signatures in most contexts. See also: Encryption, HTTPS / SSL / TLS, Certificate Authority.
Digital Transformation
Digital transformation is the process of integrating digital technology into all areas of a business, fundamentally changing how it operates and delivers value to customers. It goes beyond simply “going digital” – it involves rethinking business models, processes, culture, and customer experience through the lens of technology. Examples: a traditional retailer adding online shopping and click-and-collect; a trade business moving from paper job sheets to a mobile app and digital invoicing; a medical practice transitioning from physical records to electronic health records; or a manufacturer adding IoT sensors to equipment for predictive maintenance. Digital transformation is driven by changing customer expectations, competitive pressure, and the availability of powerful, accessible cloud tools. digital transformation and IT support for Australian businesses accelerated digital transformation during the COVID-19 pandemic. See also: Cloud Computing, SaaS, IoT.
Digital Twin
A digital twin is a real-time virtual replica of a physical object, process, or system that is continuously updated with data from the real world. The digital twin mirrors its physical counterpart, allowing analysis, simulation, and optimisation without interfering with the actual system. Applications: Manufacturing – digital twin of a production line detects inefficiencies and predicts equipment failure; Infrastructure – digital twins of bridges and buildings monitor structural health; Healthcare – patient-specific digital twins for personalised treatment simulation; Smart cities – Singapore has a national digital twin for urban planning; Aviation – Rolls-Royce uses digital twins of jet engines for predictive maintenance. Digital twins are enabled by IoT sensors, cloud computing, AI, and high-bandwidth connectivity. See also: IoT, Edge Computing, Artificial Intelligence.
Digital Wallet / Mobile Payment
A digital wallet is an app or service that stores your payment card details, bank account information, loyalty cards, event tickets, and even government ID securely on your device, enabling contactless payments without a physical card. Major digital wallets include Apple Pay (iPhone and Apple Watch), Google Pay (Android), and Samsung Pay. When you tap your phone on a payment terminal, the wallet uses NFC to transmit a unique one-time token – not your actual card number – making it protect yourself from payment scams. Australian banks universally support Apple Pay and Google Pay. Digital wallets can also store boarding passes, loyalty points, gift cards, and (increasingly) digital driver’s licences. See also: NFC, Encryption, Biometrics.
Disaster Recovery Plan (DRP)
A Disaster Recovery Plan is a documented, structured approach outlining how an organisation will respond to and recover from a catastrophic IT event – cyberattack, natural disaster, hardware failure, or human error – that renders systems unavailable. Key DRP components: Risk assessment – what events could disrupt operations? Business Impact Analysis (BIA) – which systems and processes are critical? How long can each be unavailable? Recovery objectives – RTO (Recovery Time Objective: how quickly must systems be restored?) and RPO (Recovery Point Objective: how much data loss is acceptable?); Backup and recovery procedures – detailed steps for restoring from backup; Communication plan – who is notified, how, and when; Roles and responsibilities – who does what during recovery; Testing schedule – DR plans must be regularly tested (tabletop exercises, actual failover tests). A DR plan that has never been tested is unreliable. Australian SMBs should at minimum document: where backups are stored, how to restore them, who to call, and how to communicate with customers during an outage. See also: Cloud Backup, RPO and RTO, Business Continuity, Ransomware Recovery.
Discord / Gaming Platform Security
Discord is a free voice, video, and text communication platform widely used by gaming communities, online communities, and increasingly businesses. Security considerations: Enable Two-Factor Authentication: User Settings > My Account > Enable Two-Factor Auth; protects the account and is required to become a server administrator. Scams on Discord: extremely common; include fake “free Nitro” offers (Discord’s premium subscription), fake Steam gift links, NFT scams, and fake job offers; never click suspicious links in DMs, even from friends (their accounts may be compromised). Permissions: be cautious granting server bots permissions like “Administrator”; review bot permissions carefully. Privacy settings: User Settings > Privacy & Safety; disable direct messages from server members you don’t know; be cautious who you allow to DM you. Screen sharing: be careful what is visible when screen sharing in calls – close banking, password managers, and personal information before sharing. Discord is used by minors – parents should be aware that many servers are unmoderated and exposure to adult content and strangers is a real risk. See also: Social Media Security, Gaming Platform, Multi-Factor Authentication.
Disk Clone / Drive Cloning
Disk cloning creates an exact, sector-by-sector duplicate of a storage device – copying everything including the operating system, all files, partition structure, boot sector, and even empty/unallocated space. Unlike a regular file copy, a clone can be used as a bootable replacement for the original drive. Uses: Upgrading to a larger or faster drive (clone the old drive to a new SSD, swap them, and the computer boots normally); Pre-recovery imaging (creating a working copy of a failing drive to recover from, without further stressing the failing drive); Deployment (cloning a configured system drive to multiple identical machines). Popular cloning tools include Macrium Reflect, Clonezilla, and AOMEI Backupper. For failing drives, our data recovery and drive cloning service that reads unstable sectors (like ddrescue) is preferred over standard cloning tools. See also: Disk Image, Data Recovery, SSD, NVMe SSD.
Disk Image / Forensic Image
A disk image is a single file that contains an exact copy of all the data on a storage device – every sector, including the file system structure, deleted file remnants, empty space, and metadata – in a format that can be stored, archived, and analysed without touching the original. Images are created before data recovery work begins so the original device is not further disturbed. Common disk image formats: ISO (optical disc images); IMG/RAW (raw sector-by-sector image); E01/EWF (EnCase Evidence File – standard forensic format, includes metadata, checksums, and compression); DD (Unix/Linux raw format). A our forensic data recovery service is a disk image created following strict chain-of-custody procedures, verified with cryptographic hashes (MD5 or SHA-256), for use in legal proceedings. See also: Disk Clone, Chain of Custody, Write Blocker, Data Recovery.
Display Connector Types
Different interfaces connect computers to monitors and TVs, each with different capabilities: HDMI (covered separately) – universal for TVs and consumer devices. DisplayPort (covered separately) – preferred for PC monitors. USB-C / Thunderbolt – increasingly used on laptops; carries DisplayPort or HDMI signal with the right cable or dock. VGA (Video Graphics Array) – the old analogue blue D-Sub connector; limited to 1080p, no audio; found on legacy monitors and projectors; being phased out everywhere. DVI (Digital Visual Interface) – older digital standard superseded by HDMI and DisplayPort; supports up to 2560×1600 in dual-link form; no audio. Mini DisplayPort – compact DisplayPort used on older Mac computers; adapts to full DP, HDMI, or DVI. When buying a monitor, always check that your GPU/laptop has a matching connector, or budget for an adapter or cable. See also: HDMI, DisplayPort, Thunderbolt / USB-C, Monitor.
DisplayPort
DisplayPort is a digital display interface standard developed by VESA (the same organisation that created the VESA monitor mounting standard), designed primarily for connecting computers to monitors. DisplayPort competes with HDMI and offers some advantages for PC users: higher maximum bandwidth (DisplayPort 2.1 supports up to 80 Gbps); daisy-chaining (connecting multiple monitors in series on supported hardware); and Adaptive Sync (the open standard that underpins AMD FreeSync). DisplayPort 1.4 supports 4K at 144Hz or 8K at 60Hz. DisplayPort connectors are most commonly found on desktop graphics cards and PC monitors; laptops often use USB-C/Thunderbolt to carry DisplayPort signals. HDMI remains dominant on TVs and consumer electronics; DisplayPort is preferred for PC monitors and workstations. See also: HDMI, Monitor, GPU, Thunderbolt / USB-C.
DNS (Domain Name System)
DNS is often called the “phone book of the internet.” When you type a web address like thepcdoctor.com.au into your browser, DNS translates that human-readable name into a numerical IP address (like 103.24.68.5) that computers use to find and connect to the correct web server. Without DNS, you would need to memorise number strings to visit every website. DNS lookups happen in milliseconds, invisibly, every time you access a website. Choosing a faster, more privacy-focused DNS resolver can professional internet speed optimisation: Cloudflare’s 1.1.1.1 and Google’s 8.8.8.8 are popular free alternatives to your ISP’s default DNS servers. DNS can also be used for content filtering – businesses and families use DNS-level blocking (e.g., Cloudflare for Families, OpenDNS) to block malicious websites and inappropriate content. See also: IP Addressing, Router, ISP, Browser.
DNS over HTTPS (DoH) / DNSSEC
Traditional DNS queries travel unencrypted, meaning your ISP and anyone monitoring network traffic can see every website you look up (even if the connection itself is HTTPS). Two technologies address this: DNS over HTTPS (DoH) – encrypts DNS queries by wrapping them in standard HTTPS traffic (port 443), making them indistinguishable from regular web browsing. Supported by Firefox (built-in), Chrome (Secure DNS setting), Windows 11 (Settings > Network > DNS encryption), and macOS Ventura+. Providers: professional internet and DNS configuration (1.1.1.1), Google (8.8.8.8), NextDNS. DNS over TLS (DoT) – encrypts DNS queries using TLS on port 853; similar goal to DoH but on a distinct port that can be identified and blocked by networks. DNSSEC (DNS Security Extensions) – a different concern: DNSSEC adds digital signatures to DNS records, allowing resolvers to verify that responses are authentic and haven’t been tampered with (preventing DNS spoofing/cache poisoning attacks). DoH protects privacy; DNSSEC protects integrity. See also: DNS, Encryption, VPN, Browser.
Docking Station / Port Replicator
A docking station is a device that transforms a laptop into a desktop-like workstation. You connect the docking station to your laptop via a single USB-C / Thunderbolt cable, and the dock then provides: multiple USB-A ports, USB-C ports, Ethernet, HDMI/DisplayPort video outputs (often supporting multiple external monitors), SD card slots, audio jacks, and in many cases 60–100W of laptop charging – all through that workstation setup and configuration. This means you can connect all your peripherals (monitors, keyboard, mouse, printer, webcam, Ethernet) to the dock, and switching between docked (at desk) and undocked (portable) requires unplugging just one cable. Popular dock brands include CalDigit, OWC, Dell, Lenovo, Belkin, and Anker. Ensure compatibility – Thunderbolt docks require a Thunderbolt port on the laptop for full feature support. See also: Thunderbolt / USB-C, USB, Monitor, Ethernet.
Dolby Atmos / Spatial Audio
Dolby Atmos is an advanced audio format that adds a height dimension to traditional surround sound, creating a three-dimensional sound field where audio objects can be precisely placed and moved anywhere in a sphere around the listener – including above. Unlike older 5.1/7.1 surround sound that assigns audio to fixed channels, Atmos encodes audio as objects with position metadata, and the playback system (speaker array, soundbar, or headphones) renders it optimally for the available hardware. Atmos in cinema requires a speaker array including ceiling speakers. For home use: dedicated Atmos speakers or soundbars with upward-firing drivers; AV receivers supporting Atmos decoding; or binaural rendering through headphones (Apple’s Spatial Audio processes Atmos for headphone listening). Netflix, Apple TV+, Disney+, and home theatre and audio setup. See also: HDR, Streaming, Codec.
Domain Name / URL
A domain name is the human-readable address of a website, like thepcdoctor.com.au. Domain names are registered through domain registrars (like VentraIP, Crazy Domains, or GoDaddy in Australia) for annual fees. A URL (Uniform Resource Locator) is the complete web address including the protocol, domain, and path – for example: https://thepcdoctor.com.au/computer-technical-terms. The main components of a domain name are: Protocol (https://); Subdomain (www.); Second-level domain (thepcdoctor); Top-level domain / TLD (.com.au). Australian country-code TLDs (.com.au, .net.au, .org.au) require an Australian Business Number (ABN) to register. See also: DNS, HTTPS, Web Hosting.
Dongle
A dongle is a small hardware device that plugs into a USB port (or other interface) to add functionality to a computer. The term covers a wide range of devices: Wireless network dongles – USB Wi-Fi adapters that add wireless connectivity to desktop PCs lacking built-in Wi-Fi; Bluetooth dongles – add Bluetooth to computers without it; Software licence dongles – hardware keys required to run specific software (common in professional design, engineering, and audio software); Streaming sticks – like Chromecast or Amazon Fire TV Stick, plugging into HDMI rather than USB (sometimes called “streaming dongles”); and Mobile broadband dongles – USB devices containing a SIM card for 4G/5G internet on computers. Dongles are also colloquially used to refer to any adapter – including USB-C to HDMI or USB-A adapters. See also: USB, Bluetooth, Wi-Fi.
Donor Drive
A donor drive is a matching hard drive used to supply replacement parts for a physically damaged drive in a professional data recovery operation. In many HDD recovery scenarios – particularly head crashes or PCB (circuit board) failures – the damaged component must be replaced with a working equivalent before data can be read. The donor drive must be the same make, model, revision, and often the same firmware version and head configuration as the patient drive. Sourcing the right donor can be the most challenging and expensive part of a physical recovery. After transplanting the needed component, the recovery is performed in a cleanroom environment. This is why get a free quote for data recovery and why prices vary significantly – donor drives for rare or old models can be very costly or nearly impossible to find. See also: Cleanroom, Data Recovery, Head Crash, PCB (Drive).
Double-Click vs Single Click
Clicking means pressing and releasing the left mouse button. Single-click is used to select an item (highlighting a file, clicking a button, following a web link). Double-click means pressing the left mouse button twice rapidly and is used to open a file or program (opening a document from the desktop or File Explorer), or to select a word in a text document. If a file does not open when you double-click it, you may be double-clicking too slowly – adjust the double-click speed in Control Panel > Mouse settings. Right-click opens the context menu. Middle-click (clicking the scroll wheel) opens links in a new browser tab and closes tabs. See also: Context Menu, Mouse.
Download
A download is the transfer of digital data from a remote server to your local device. Viewing a website is technically a download because all the words, images, scripts, and videos on that page are transferred to your device. Other downloads include receiving emails, streaming music and video, installing software updates, and transferring files from cloud storage. Download speed (Mbps) is one of the primary metrics of internet connection performance and is what most Australian NBN speed tiers are marketed on. See also: Upload, Bandwidth, Streaming.
DPI (Dots Per Inch) in Printing
DPI (dots per inch) measures the resolution of printed output – how many individual ink dots a printer places within one linear inch. Higher DPI generally produces sharper, more detailed prints. Common printer DPI values: basic inkjet 300–600 DPI (sufficient for documents and casual photos); photo inkjet printers 1200–4800 DPI (required for fine photographic prints); laser printers typically printer setup and configuration (sharp text, good graphics). Image resolution for printing: an image needs at least 300 PPI (pixels per inch) at the intended print size for sharp results. A 12-megapixel photo (4000×3000 pixels) can print sharply at approximately 33×25cm at 300 PPI. Scaling an image larger than this introduces visible pixelation. DPI vs PPI: PPI refers to the pixel density of digital images and screens; DPI refers to the dot density of physical printed output – these terms are often used interchangeably but are technically different. Vector graphics (SVG, EPS, AI) are resolution-independent and can be scaled to any size without pixelation. See also: Printer, Pixel, Screen Resolution Guide.
Drag and Drop
Drag and drop is a mouse (or touchscreen) technique for moving or copying items. To drag an item: click and hold the left mouse button on the item, move the mouse to the new location while holding the button, then release the button to “drop” it there. Common uses: moving files between folders; rearranging items in a list; resizing windows by dragging their edges; moving browser tabs; and adding files to an email by dragging them onto the compose window. On a touchscreen, drag is performed by pressing and holding briefly, then sliding the finger. See also: Mouse, File and Folder, Touchscreen.
Drawing Tablet / Graphics Tablet / Stylus Pen
A drawing tablet is an input device that allows artists, designers, and creative professionals to draw, sketch, paint, and sign documents on a computer using a pressure-sensitive stylus (pen), closely replicating the feel of drawing on paper. The tablet surface senses the position, pressure, tilt, and rotation of the stylus. Wacom is the most respected brand, with products ranging from entry-level (Wacom Intuos) to professional (Wacom Cintiq – which has a built-in screen you draw directly on). Other popular options include XP-Pen and Huion. Drawing tablets connect via USB or Bluetooth. Apple’s iPad with Apple Pencil serves as an alternative creative input device that also functions as a standalone tablet computer. See also: USB, Bluetooth, GPU.
Driver (Device Driver)
A device driver is a small software program that allows your operating system to communicate with and control a specific hardware device – such as a printer, graphics card, network adapter, sound card, webcam, or USB device. Without the correct driver, your operating system does not know how to “talk to” the hardware and the device won’t function. Drivers are typically provided by hardware manufacturers and distributed through Windows Update, manufacturer websites, or included on a CD (though physical media is increasingly rare). Keeping drivers updated – particularly GPU drivers and network adapter drivers – can improve performance, stability, and security. Outdated or corrupted drivers are a common cause of hardware malfunction and system crashes (BSODs). See also: OS (Operating System), GPU, Windows Updates.
DRM (Digital Rights Management)
Digital Rights Management refers to technologies used by publishers, manufacturers, and content owners to control how digital media (music, movies, eBooks, software, games) is used after purchase. DRM can restrict the number of devices content can be played on, prevent copying, limit offline access, or require an internet connection to verify a licence. Examples include: Steam’s online game authentication, Netflix’s locked streaming content that cannot be downloaded to unrestricted files, Adobe’s encrypted eBook format, and Windows software licence activation. DRM is controversial because it can inconvenience legitimate customers while technically savvy pirates often circumvent it. See also: Open Source Software, SaaS.
DSLR vs Mirrorless vs Smartphone Camera
The camera market has evolved significantly: DSLR (Digital Single-Lens Reflex) – uses a mirror and optical viewfinder; large body; extensive lens ecosystem; excellent battery life; being discontinued by most manufacturers in favour of mirrorless; Canon, Nikon, Pentax. Mirrorless cameras – no mirror; uses electronic viewfinder; more compact than DSLR; faster autofocus (particularly for tracking subjects); real-time exposure preview; the current professional standard; Sony A-series, Canon R-series, Nikon Z-series, Fujifilm X-series, Olympus/OM System, Panasonic Lumix. Compact cameras (point-and-shoot) – small, fixed lens; convenient but limited. Smartphone cameras – always with you; computational photography (AI processing) has dramatically narrowed the quality gap with dedicated cameras; multi-camera systems (wide, ultrawide, telephoto) provide versatility; excellent for social media and casual use. For most Australians, a device setup and support (iPhone, Samsung Galaxy, Google Pixel) delivers excellent results without the cost and complexity of a dedicated camera. See also: Digital Photography, RAW Image Format, Cloud Backup.
E-Reader / Kindle
An e-reader is a portable electronic device designed primarily for reading digital books (eBooks) using an e-ink display. E-ink technology mimics the appearance of printed ink on paper – it reflects light rather than emitting it, drastically reducing eye strain compared to backlit LCD screens; battery life is measured in weeks rather than hours because the screen only consumes power when the image changes. The dominant e-reader is the Amazon Kindle series (Kindle Basic, Kindle Paperwhite – most popular with backlight, waterproof; Kindle Scribe – with stylus for handwriting). Competitors: Kobo (Rakuten – strong in Australia; integrates with local library borrowing); PocketBook; and various Android-based devices. eBook formats: EPUB (the universal standard); MOBI/AZW3 (Kindle proprietary); PDF (works but not ideal for reading). Australian public libraries offer free eBook lending via apps like Libby (OverDrive) – free access to thousands of titles with a library card. See also: Digital Literacy, Bluetooth, Wi-Fi.
E-Waste (Electronic Waste)
E-waste refers to discarded electronic devices and components – old computers, laptops, monitors, smartphones, printers, batteries, cables, and other electrical equipment. E-waste is one of the world’s fastest-growing waste streams, containing valuable materials (gold, silver, copper, rare earth elements) but also hazardous substances (lead, mercury, cadmium) that can leach into soil and water if disposed of improperly. In Australia, MobileMend, Officeworks, and council recycling centres accept e-waste. The National Television and Computer Recycling Scheme (NTCRS) provides free drop-off for computer and TV e-waste. Before disposing of any device, ensure all personal data is secure data erasure before disposal. See also: Green IT, Data Breach.
ECC RAM (Error-Correcting Code RAM)
ECC (Error-Correcting Code) RAM is a type of computer memory that can automatically detect and correct single-bit memory errors in real time, preventing data corruption from cosmic rays, electrical interference, or natural bit-flips. Standard (non-ECC) RAM simply passes data without verification; a single bit-flip could corrupt data or cause a crash without warning. ECC RAM adds extra bits per data word (typically 8 bits per 64-bit word) to perform Hamming code error detection and correction. ECC RAM is mandatory in: servers handling critical workloads; workstations doing scientific computation; medical and financial systems; and any application where data integrity is paramount. ECC RAM typically requires a server-class or workstation motherboard and CPU – most consumer Intel Core and AMD Ryzen CPUs don’t support ECC (AMD EPYC and Intel Xeon do). See also: RAM, Server, Motherboard.
eCommerce / Online Store
eCommerce refers to buying and selling products and services over the internet. Key platforms for Australian businesses building online stores: Shopify – the most popular hosted eCommerce platform; monthly subscription; includes payment processing, inventory, shipping, and marketing tools; excellent for product-based businesses. eCommerce website setup and IT support – a free WordPress plugin that adds eCommerce to any WordPress site; highly customisable; requires more technical knowledge than Shopify; popular for businesses already using WordPress. Wix eCommerce / Squarespace Commerce – simple hosted options good for small product catalogues. BigCommerce – strong for mid-market merchants needing scalability. Key eCommerce requirements: secure checkout (HTTPS, PCI-compliant payment processing); clear returns and refund policy (mandatory under Australian Consumer Law); GST handling (10% on Australian sales); shipping integration; and mobile-optimised design. Australian Consumer Law (ACL) gives online shoppers the same protections as in-store buyers, including statutory guarantees on products. See also: POS, Digital Wallet, PayID, GST / BAS, Web Hosting.
Edge AI / On-Device AI
Edge AI refers to the deployment of artificial intelligence algorithms directly on local devices (smartphones, cameras, sensors, industrial equipment) rather than sending data to the cloud for processing. By running AI inference at the “edge” (the device), Edge AI enables: Real-time processing without internet latency; Privacy protection (sensitive data never leaves the device); Offline operation (AI works without internet); and Reduced bandwidth and cloud costs. Examples: Face ID on iPhones processes biometric data entirely on-device; smart security cameras that detect intruders locally; industrial predictive maintenance sensors; and AI-powered hearing aids. The NPU (Neural Processing Unit) in AI PCs is specifically designed for efficient Edge AI inference. See also: AI Computing / AI PC, Edge Computing, IoT, GPU.
Edge Computing
Edge computing processes data close to the source (at the “edge” of the network) rather than sending it to a distant centralised cloud server. For example, a smart security camera that runs facial recognition analysis locally on the camera, rather than uploading every frame of footage to a cloud server, is using edge computing. Benefits include reduced latency, saved bandwidth, improved privacy, and continued operation if internet connectivity is lost. Edge computing is critical for applications requiring real-time processing: autonomous vehicles, industrial robotics, smart city infrastructure, remote medical devices, and IoT sensors. See also: Cloud Computing, IoT, Latency.
eInvoicing (Australia)
eInvoicing is the digital exchange of invoice data directly between business software systems – not just emailing a PDF, but structured data flowing automatically between accounting systems. Australia adopted the Peppol (Pan-European Public Procurement Online) standard for eInvoicing. When a supplier sends a Peppol eInvoice, it arrives directly in the recipient’s accounting software (accounting software and eInvoicing setup) as structured data, ready for processing – no manual data entry, no lost invoices, no scanning. The Australian Government mandated eInvoicing for all federal agencies and encourages business adoption. Benefits: faster payment processing (reduced from 12+ days to 5 days average); reduced fraud (harder to spoof than emailed PDFs); lower processing costs; and real-time visibility. As of 2023, businesses can connect to the Peppol network through accredited access points. See also: Cloud Computing, API, ATO Digital Services.
Email (Electronic Mail)
Email is the electronic equivalent of sending a letter, allowing messages and file attachments to be sent between individuals via the internet almost instantly. Key components: Email address – a unique identifier in the format [email protected] (e.g., [email protected]); Inbox – where incoming messages arrive; Sent folder – copies of messages you have sent; Drafts – saved unsent messages; Spam/Junk folder – where suspected unwanted emails are filtered. Popular email services include email setup and support service (Microsoft), Yahoo Mail, and Apple Mail. Email clients (programs) include Microsoft Outlook, Apple Mail, and Mozilla Thunderbird. Most email providers now offer free accounts with web access (webmail) and can be set up on smartphones and tablets. See also: Spam, Phishing, Attachment, IMAP / POP3 / SMTP.
Email Encryption (PGP / S/MIME)
Standard emails are transmitted and stored in plaintext – your email provider, network administrators, and potentially government agencies can read them. Email encryption adds a layer of protection. S/MIME (Secure/Multipurpose Internet Mail Extensions) – the enterprise standard; uses digital certificates to encrypt and sign emails; supported natively by Outlook, Apple Mail, and most business email clients; requires both sender and recipient to have certificates. PGP (Pretty Good Privacy) / GPG (GNU Privacy Guard) – an open-standard approach using key pairs; popular among journalists, activists, and security professionals; requires both parties to have and exchange public keys. Encrypted email services – ProtonMail, Tutanota/Tuta – provide end-to-end encrypted email with a simplified user experience; used extensively in Australia by privacy-conscious professionals. See also: Encryption, Email, Digital Signature, Cybersecurity.
Email Spoofing
Email spoofing is the forgery of an email’s sender address to make it appear as if the message came from a different source – typically a trusted person, organisation, or brand. Because the original email protocol (SMTP) has no built-in authentication, anyone can technically send an email claiming to be from any address. Spoofed emails are used in: phishing attacks (impersonating your bank, the ATO, or a trusted colleague); Business Email Compromise (BEC) scams (impersonating a CEO to authorise fraudulent payments); and spam campaigns. professional email security setup records configured on your domain’s DNS. When you receive an email, your email client can show you the authentication results – Gmail’s “Show original” feature reveals SPF, DKIM, and DMARC pass/fail results. See also: SPF / DKIM / DMARC, Phishing, Spam, DNS.
Vector Embeddings
Vector embeddings are numerical representations of words, sentences, images, or other data as points in a high-dimensional mathematical space, where semantically similar items are positioned close together. For example, the words “king,” “queen,” “monarch,” and “royalty” would have similar embedding vectors, while “king” and “tractor” would be far apart. Embeddings capture semantic meaning in a way that enables AI systems to perform: semantic search (finding documents by meaning rather than exact keywords); recommendation systems (finding similar products, movies, or songs); RAG retrieval (finding relevant context for AI responses); anomaly detection; and clustering. Embeddings are created by running data through a neural network. Databases like Pinecone, Weaviate, and pgvector (PostgreSQL extension) specialise in storing and querying vector embeddings efficiently. See also: RAG, Neural Network, Machine Learning.
Encryption / End-to-End Encryption
Encryption is the process of converting readable data (plaintext) into an unreadable scrambled format (ciphertext) using a mathematical algorithm and key. Only someone with the correct decryption key can reverse the process and read the data. Encryption is the foundation of secure digital communication and data protection. End-to-End Encryption (E2EE) means data is encrypted on the sender’s device and can only be decrypted by the intended recipient – even the service provider’s servers cannot read the content. WhatsApp, Signal, and iMessage use E2EE for messages. AES-256 (Advanced Encryption Standard, 256-bit key) is the most widely used symmetric encryption algorithm, considered unbreakable with current technology. RSA and ECC are asymmetric encryption algorithms used for secure key exchange. See also: HTTPS / SSL / TLS, VPN, Cybersecurity, Quantum Computing.
Ergonomic Accessories
Ergonomic accessories are designed to reduce physical strain, discomfort, and the risk of repetitive strain injury (RSI) and musculoskeletal problems from extended computer use. Key ergonomic peripherals: Ergonomic keyboard (split or curved design reducing wrist pronation – e.g., Microsoft Sculpt, Logitech ERGO K860); Vertical mouse (held in a handshake position, reducing forearm rotation – Logitech MX Vertical); Wrist rest (pads providing support for keyboard and mouse use); Monitor stand or arm (adjusting screen height so the top of the monitor is at eye level); Footrest; Laptop stand (raising the screen to eye level – should be paired with an external keyboard and mouse); Adjustable desk (sit-stand desk). Proper ergonomic setup significantly reduces neck, shoulder, wrist, and lower back problems with long-term computing. See also: Monitor, Keyboard (Peripheral), Mouse.
ERP (Enterprise Resource Planning)
An ERP system is integrated software that manages core business processes across an entire organisation – finance, accounting, procurement, supply chain, manufacturing, HR, and more – in a single unified system with a shared database. Rather than separate software for accounting, inventory, and HR that don’t talk to each other, an ERP provides a single source of truth. Major ERP vendors: SAP (dominant in large enterprises globally), Oracle ERP Cloud, Microsoft Dynamics 365 Business Central, NetSuite (popular for mid-market), and MYOB Advanced (widely used in Australia for mid-sized businesses). ERP implementations are complex and expensive projects, but provide significant efficiency, visibility, and compliance benefits. See also: CRM, Database, Cloud Computing, SaaS.
eSIM (Embedded SIM)
An eSIM (Embedded Subscriber Identity Module) is a digital SIM card built directly into a device rather than being a physical removable card. Instead of inserting a physical SIM, you activate an eSIM by scanning a QR code or entering an activation code from your carrier – the profile is then downloaded directly to the embedded chip. Benefits include: switching carriers without physically swapping cards; having two numbers on one device (one physical SIM + one eSIM, or dual eSIM on newer iPhones); and thinner device designs without a SIM card slot. All modern iPhones (15 and later in Australia), recent Samsung Galaxy flagships, Google Pixel phones, and many modern laptops support eSIM. When travelling internationally, you can add a local eSIM data plan without removing your home SIM. See also: SIM Card, 5G.
esports
Esports (electronic sports) refers to organised, competitive video gaming at a professional or semi-professional level, often in front of live and online audiences and for substantial prize money. Major esports titles include League of Legends, Dota 2, Counter-Strike 2 (CS2), Valorant, Overwatch 2, StarCraft II, and fighting games like Street Fighter and Super Smash Bros. Global esports viewership rivals or exceeds traditional sports in younger demographics – the 2023 League of Legends World Championship attracted over 6 million concurrent viewers. Professional esports players require extremely fast internet (sub-10ms latency), high-refresh-rate monitors (240Hz+), and high-performance peripherals (low-latency internet setup for gaming mice, mechanical keyboards). In Australia, esports is a growing industry with a number of professional teams and a dedicated esports stadium ecosystem. See also: FPS (Gaming), Refresh Rate, Latency.
Ethernet
Ethernet is the world’s most widely deployed wired local area networking technology, standardised by the IEEE (Institute of Electrical and Electronics Engineers) as the 802.3 family of standards. Ethernet uses RJ45 cables (the wider version of a phone cable plug) to connect devices to a network switch or router. Standard speeds include Fast Ethernet (100 Mbps), Gigabit Ethernet (1 Gbps, the most common for home and office), 2.5 Gbps, 5 Gbps, and 10 Gbps for enterprise and enthusiast use. A wired Ethernet connection is almost always faster, more reliable, and lower-latency than Wi-Fi, making it the preferred choice for desktop computers, gaming consoles, NAS devices, and IP cameras. See also: Router, Network Switch, Wi-Fi, Network.
Ethernet Cable Types (Cat5e / Cat6 / Cat6A / Cat8)
Not all Ethernet cables are created equal. The “Cat” (Category) rating indicates performance capability: Cat5e (Enhanced Category 5) – supports Gigabit Ethernet (1 Gbps) up to 100 metres; sufficient for most home and small office use; the minimum standard for new installations. Cat6 – supports 1 Gbps to 100m and 10 Gbps to 55m; reduced crosstalk; slightly thicker and stiffer; recommended for new home installations and offices. Cat6A (Augmented) – supports 10 Gbps up to 100m; better shielding (STP variant); recommended for office structured cabling, server rooms, and future-proofing. Cat7 – proprietary standard (not IEEE-recognised); fully shielded; mostly superseded by Cat6A. Cat8 – supports 25–40 Gbps at up to 30m; primarily for data centre use connecting switches and servers. Patch cable vs solid core: patch cables (stranded copper) are flexible and used for short runs; solid core cable is used for long runs in walls but is less flexible. Cable quality matters: professional network cabling and setup; cheap cables often use copper-clad aluminium (CCA) rather than solid copper, giving significantly worse performance. See also: Ethernet, Network Switch, Power over Ethernet (PoE).
External Hard Drive / External SSD
An external hard drive or external SSD is a portable storage device that connects to a computer via USB (or Thunderbolt) and provides additional storage capacity or a backup location outside the main computer. External HDDs are available in 1–20TB capacity at relatively low cost (around $60–$150 AUD for 1–2TB); they are best for backup and archival storage. External SSDs are faster, more compact, more shock-resistant, and more expensive than external HDDs – ideal for professionals needing fast portable storage for large files (photographers, videographers, media professionals). Portable external drives are powered via USB; desktop external drives (3.5-inch HDDs) require a separate power adapter. For backup purposes, our data recovery service stored offsite (at a different location from your computer) to protect against theft, fire, or flood. See also: Cloud Backup, USB, RAID, Data Recovery.
Factory Reset
A factory reset wipes a device and returns it to the original state it was in when it left the factory – removing all personal data, installed apps, saved settings, and accounts. This is used when: selling or giving away a device (to ensure your data cannot be accessed by the new owner); resolving severe software problems that cannot be fixed any other way; removing persistent malware; or preparing a device for a fresh start. On Windows 11, go to Settings > System > Recovery > Reset this PC. On Android, go to Settings > General Management > Reset > Factory Data Reset. On iPhone/iPad, go to Settings > General > Transfer or Reset iPhone > Erase All Content and Settings. Always data recovery service before performing a factory reset – it cannot be undone. See also: Default Settings, Cloud Backup, Data Recovery.
Fake Invoice / Business Email Compromise
Fake invoice fraud (also called payment redirection fraud) is a financially devastating scam targeting businesses. The attack: criminals monitor a company’s email communications (through a compromised email account or by spoofing email addresses), identify ongoing supplier relationships, then send a convincing email impersonating a legitimate supplier with a “change of bank account details” for future payments. Finance staff unknowingly pay invoices to the fraudster’s account. Variations: CEO fraud (email apparently from the CEO to finance staff requesting urgent wire transfer); Supplier impersonation (scammer impersonates a regular supplier); Conveyancing fraud (redirecting property settlement payments – Australian property transactions have been heavily targeted). Prevention: Always verify bank account changes by phone using a previously known contact number (not one provided in the email); implement a multi-approval policy for any payment over a threshold; train staff to recognise BEC tactics; use email authentication (DMARC); and be especially vigilant around large one-off payments. See also: Business Email Compromise, Phishing, Email Spoofing, Social Engineering.
Fibre Optic Cable
Fibre optic cable transmits data as pulses of light through thin strands of glass or plastic fibre rather than as electrical signals through copper wire. This gives fibre optic cables a massive advantage over copper: vastly higher bandwidth (capable of many terabits per second over long distances), no electromagnetic interference, significantly lower signal loss over long distances, and no electric shock risk. Fibre optic cables form the backbone of the global internet, undersea intercontinental cables, and high-speed data centre interconnects. In NBN terminology, FTTP (Fibre to the Premises) means fibre runs all the way to your home or business – the fastest and most reliable NBN technology. FTTN (Fibre to the Node) and FTTC (Fibre to the Curb) run fibre to a nearby point and then use existing copper for the last leg, which limits maximum speeds. See also: NBN, Bandwidth, Broadband.
File Extension
A file extension is the short suffix after the dot in a filename that identifies what type of file it is and which programs can open it. Examples: Documents: .doc / .docx (Microsoft Word), .pdf (Adobe PDF), .txt (plain text), .odt (LibreOffice); Images: .jpg / .jpeg, .png, .gif, .webp, .heic (Apple), .raw (camera raw); Audio: .mp3, .aac, .wav, .flac, .ogg; Video: .mp4, .mkv, .avi, .mov; Spreadsheets: .xlsx (Excel), .csv (plain text table); Compressed: .zip, .rar, .7z; Programs: .exe (Windows), .dmg (Mac installer), .apk (Android); Web: .html, .css, .js. Windows hides file extensions by default; enabling them (in File Explorer > View > Show > File name extensions) is helpful for understanding what you are dealing with. See also: File and Folder.
File and Folder
A file is any individual item stored on a computer – a document, photo, video, music track, spreadsheet, program, or any other piece of data. Every file has a filename and a file extension that indicates its type: .docx (Word document), .pdf (PDF), .jpg or .png (image), .mp3 or .aac (audio), .mp4 (video), .xlsx (Excel spreadsheet), .exe (Windows program). A folder (called a directory in technical language) is a container used to organise files – like a real-world filing cabinet with labelled folders. Folders can contain files and other folders (subfolders). In Windows, files and folders are accessed through File Explorer (Win+E). In macOS, the equivalent is Finder. Organising files in clearly named folders rather than leaving everything in one place makes your digital life much easier to manage. See also: Desktop (UI), Cloud Backup, File Extension.
File Permissions (Windows / Mac / Linux)
File permissions control which users and processes can read, write, or execute files and folders. Windows NTFS permissions: each file and folder has an Access Control List (ACL) defining what specific users and groups can do: Full Control, Modify, Read & Execute, Read, Write. Permissions can be inherited (from parent folder) or explicitly set. Viewing permissions: right-click file > Properties > Security tab. Common issue: “Access Denied” errors often indicate a permission problem rather than file corruption. macOS permissions: similar model using owner/group/everyone permissions visible in Get Info (Cmd+I) > Sharing & Permissions. Linux permissions use the rwx (read/write/execute) system for owner, group, and others; represented as numbers (chmod 755) or letters (chmod u+x). Principle of least privilege: users should only have the permissions necessary for their role – a professional Windows and Mac setup (not administrator) for daily computing limits damage from malware and accidents. See also: User Account, Active Directory, Group Policy.
File System
A file system is the method a storage device uses to organise, store, name, and access files and directories. Without a file system, a drive is just raw data with no way to find individual files. Common file systems: NTFS (New Technology File System) – the default for Windows drives; supports large files (over 4GB), permissions, encryption, journaling (reducing corruption risk); FAT32 – older, highly compatible (works on Windows, Mac, Linux, cameras, TVs, game consoles); limited to 4GB maximum file size and 8TB volume; still used for USB drives and SD cards for cross-device compatibility; exFAT – modern replacement for FAT32, supports large files, compatible across platforms; ideal for large USB drives and memory cards; APFS (Apple File System) – default for modern macOS and iOS; ext4 – standard Linux file system; HFS+ – older Apple file system. File system corruption is a common cause of data inaccessibility. See also: Data Recovery, Partition, MBR / GPT.
FileVault (Mac Encryption)
FileVault is Apple’s full-disk encryption feature for Macs, encrypting the entire startup disk using XTS-AES-128 encryption. On Macs with Apple Silicon or the T2 security chip, FileVault is automatically active when you set a login password – the hardware handles encryption transparently with no performance impact. On older Macs, FileVault must be enabled manually in System Settings > Privacy & Security > FileVault. When enabled, your Mac is completely unreadable without your login password – protecting all data if the Mac is lost or stolen. Recovery Key – when you enable FileVault, you receive a 24-character recovery key or can store it with Apple using your Apple ID. Store this key safely; without it and your password, data is permanently inaccessible. Equivalent to Windows BitLocker. Mac encryption and security setup or storing sensitive data should have FileVault enabled. See also: BitLocker, Encryption, macOS Security, Apple Silicon.
Find My (Apple)
Find My is Apple’s device tracking and location sharing service, accessible via the Find My app or findmy.apple.com. Features: Find My iPhone / iPad / Mac – locate a lost or stolen device on a map; Lost Mode – remotely lock the device with a passcode, display a custom message with contact details, and track its location; Remote Erase – wipe all data remotely if recovery is impossible; Activation Lock – links the device to your Apple ID so it cannot be reactivated without your credentials even after a factory reset (makes stolen iPhones much less valuable to thieves); Find My network – uses hundreds of millions of Apple devices as anonymous Bluetooth sensors to locate offline devices; AirTag tracking; and Share My Location for family sharing. Mac and iPhone support services – it is your most powerful tool if your iPhone or Mac is lost or stolen. See also: Apple ID, Activation Lock, iCloud.
Finder / Spotlight Search
Finder is the macOS file management application – the equivalent of Windows File Explorer. It provides a visual interface for navigating files and folders, copying and moving data, connecting to network drives and servers, and managing external drives. The Finder sidebar gives quick access to iCloud Drive, AirDrop, Desktop, Documents, Downloads, and connected devices. Unlike Windows, Macs do not use drive letters (C:, D:) – all storage appears in a unified hierarchy starting from the root. Spotlight (Cmd+Space) is macOS’s universal search tool – it instantly searches across files, apps, emails, calendar events, contacts, web, and even performs calculations and unit conversions. Spotlight is far more powerful than Windows Search in most scenarios. Quick Look (press Space on any file in Finder) previews documents, images, videos, and PDFs without opening the app. See also: File and Folder, macOS Versions.
Fine-Tuning (AI Models)
Fine-tuning is the process of taking a pre-trained AI model (trained on vast general data) and continuing its training on a smaller, specialised dataset to adapt it for a specific task or domain. Rather than training a model from scratch (which requires enormous computing resources), fine-tuning leverages the general knowledge already learned and specialises it. Examples: fine-tuning GPT on a company’s internal documents so it answers in the company’s voice and style; fine-tuning a vision model on medical images for radiology; or fine-tuning a language model on legal contracts for contract analysis. RLHF (Reinforcement Learning from Human Feedback) is a fine-tuning technique where human raters score model outputs, and those scores are used to further train the model to produce more helpful, accurate, and safe responses – this is how models like ChatGPT and Claude are aligned. See also: Machine Learning, Large Language Model (LLM), GPU.
Firewall
A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predefined security rules. It acts as a barrier between trusted internal networks and untrusted external networks (such as the internet), blocking suspicious or unauthorised traffic. Firewalls can be: Hardware firewalls – dedicated physical appliances (enterprise brands include WatchGuard, Fortinet, Palo Alto, Cisco ASA); Software firewalls – programs running on individual computers (Windows Defender Firewall); or Cloud/next-generation firewalls – combining traditional firewall features with deep packet inspection, intrusion detection/prevention (IDS/IPS), application-layer filtering, and SSL inspection. Every home router includes a basic NAT-based firewall. Businesses should use dedicated hardware firewall appliances for stronger network security. See also: Cybersecurity, Router, VPN, WAF, Zero Trust Security.
Firmware
Firmware is a class of software that is permanently programmed into a hardware device’s non-volatile memory (ROM, EEPROM, or flash memory). Unlike regular software that runs on top of an operating system, firmware is embedded directly in hardware and provides the low-level control instructions for the device to function. Examples: the UEFI/BIOS on your motherboard; the software on your router that handles network traffic; the program in your printer that controls printing; and the software in a hard drive’s controller that manages data storage. Firmware updates (flashing) are released by manufacturers to fix bugs, patch security vulnerabilities, improve compatibility, and add features. Keeping router and firewall firmware updated is particularly important from a security perspective. See also: BIOS / UEFI, Router, Driver.
Router Security Best Practices
Your home or office router is the gateway between your entire network and the internet, making its security critically important. Essential router security steps: Change the default admin password immediately – default credentials (often “admin/admin”) are publicly documented and exploited by attackers; Update firmware regularly – routers receive security patches; set automatic updates if available; Disable WPS (Wi-Fi Protected Setup) – WPS has known security vulnerabilities; Use WPA3 or WPA2 encryption with a strong, unique Wi-Fi password; Disable remote management unless specifically needed; Enable the firewall; Set up a guest network for visitors and IoT devices; Check connected devices regularly for unknown devices; and Use a reputable DNS like 1.1.1.1 (Cloudflare) for added protection. router upgrade and Wi-Fi installation service (5+ years) may no longer receive security updates and should be replaced. See also: Router, Firmware, WPA3, Guest Network, Cybersecurity.
Flash Storage / NAND Flash
Flash storage is a type of non-volatile memory that retains data without power, using floating-gate transistors to store electrical charges representing 0s and 1s. It is the technology underlying SSDs, USB flash drives, SD cards, and smartphone storage. NAND flash comes in different cell types with different trade-offs: SLC (Single-Level Cell) – 1 bit per cell; fastest, most durable, most expensive; used in enterprise applications. MLC (Multi-Level Cell) – 2 bits per cell; good balance of performance, endurance, and cost. TLC (Triple-Level Cell) – 3 bits per cell; most common in consumer SSDs. QLC (Quad-Level Cell) – 4 bits per cell; highest capacity and lowest cost but lowest endurance; suitable for read-heavy workloads. Understanding NAND flash types helps explain SSD upgrade service and why enterprise SSDs cost much more than consumer drives. See also: SSD, Wear Leveling, TRIM.
Floppy Disk / Obsolete Storage Media
A brief history of storage media that have been superseded: Floppy disk – the 3.5-inch floppy disk (holding 1.44MB) was the standard portable storage medium through the 1980s and 1990s; the 5.25-inch variety preceded it. Remarkably, some industrial and government systems in Australia still use floppy disks for firmware updates on legacy equipment. ZIP drive – an intermediate format (100–750MB) bridging floppy and CD. CD/DVD/HD-DVD – optical discs dominated from the mid-1990s to mid-2000s; Blu-ray is the surviving format. VHS / Betamax – analogue video tape formats; transferring VHS to digital is a common request as tapes degrade over time (tape deterioration begins approximately 15–25 years after recording). Converting old media: legacy media conversion and digitisation, professional digitisation services, and Super8 film scanning services help preserve old memories before tapes and film deteriorate permanently. See also: Blu-ray, Cloud Backup, E-Waste.
Forensic Imaging
Forensic imaging is the process of creating a verified, exact bit-for-bit copy (forensic image) of a storage device following strict evidentiary procedures that ensure the integrity and admissibility of the data in legal proceedings. Key requirements: the imaging process must not modify the source device in any way (enforced by using a write blocker); the image must be verified with cryptographic hash values (MD5, SHA-1, or SHA-256) – any modification of the image, even a single bit, produces a completely different hash, proving tampering; and the process must be thoroughly documented. Forensic imaging is performed by our forensic data recovery service Australia for criminal investigations, civil litigation, employee misconduct cases, intellectual property theft, and divorce proceedings involving digital evidence. See also: Disk Image, Write Blocker, Chain of Custody, Data Recovery.
PC Form Factor (ATX / ITX / Micro-ATX)
Form factor describes the physical size and shape standards for PC motherboards and cases, determining compatibility. Common motherboard form factors: ATX (305mm × 244mm) – the standard full-size desktop motherboard; typically 7 expansion slots; maximum features and expandability; requires a full or mid-tower case. Micro-ATX (244mm × 244mm) – slightly smaller; 4 expansion slots; good balance of features and size; fits mid-tower and mini-tower cases. Mini-ITX (170mm × 170mm) – compact; only 1 PCIe slot; designed for small form factor (SFF) builds; requires compact cases. E-ATX (305mm × 330mm) – extra-large for high-end workstations and servers with many PCIe slots. ITX cases are popular for living room PCs and space-constrained setups; ATX remains standard for most desktop builds. See also: Motherboard, PCIe, CPU.
FPS (Frames Per Second) in Gaming
In gaming, FPS measures how many unique frames (images) your system can render and display per second. Higher FPS produces smoother, more responsive gameplay. Common FPS targets: 30 FPS – minimum playable for most games, typical on consoles in quality modes; 60 FPS – the standard for smooth gameplay; 120 FPS – noticeably smoother, requires a 120Hz+ display; 144/165/240 FPS – competitive gaming standards. FPS is determined by the power of your GPU and CPU relative to the game’s demands and graphics settings. FPS drops during intensive scenes cause “stuttering.” Note: FPS (frames per second) is different from Mbps (megabits per second used for internet speeds). Frame time (milliseconds per frame) is a more precise indicator of smoothness than average FPS. See also: GPU, Refresh Rate, Monitor.
Fragmentation / Defragmentation
Fragmentation occurs when a file system splits files into non-contiguous pieces (fragments) stored in different locations across a hard drive. Over time, as files are created, deleted, and modified, free space becomes scattered throughout the drive, causing new files to be broken into fragments wherever free space exists. On traditional spinning HDDs, reading fragmented files is slower because the read/write head must physically move to multiple locations. Defragmentation (defrag) reorganises fragmented files back into contiguous blocks, improving HDD read performance. Windows includes a built-in disk optimiser (previously called Defragmenter) that defragments HDDs automatically on a schedule. Important: never defragment an SSD – SSDs have no moving parts, do not benefit from defragmentation, and the additional writes required reduce the SSD’s lifespan. See also: Hard Drive (HDD), SSD, File System, TRIM.
Framework vs Library
Two commonly confused programming concepts: A library is a collection of pre-written code (functions and classes) that you call when you need specific functionality – your code remains in control and you decide when to use the library. Examples: NumPy (Python maths), Axios (JavaScript HTTP requests), Lodash (utility functions). A framework provides the overall structure of your application and calls your code at the appropriate points – the framework is in control (called “Inversion of Control”). Examples: React, Angular, Vue (JavaScript web UIs), Django, Rails (web backends), Flutter (mobile apps). A helpful analogy: a library is like a toolkit (you pick up the tools when you need them); a framework is like a construction site (the site dictates where things go, and you fill in the specific details). See also: Programming Language, Open Source Software, API.
Freeze – See: Crash / Freeze / Hang
FTP / SFTP / SCP (File Transfer Protocols)
FTP (File Transfer Protocol) is the classic protocol for transferring files between computers over a network. FTP uses port 21 and transmits data in plaintext – meaning passwords and files are visible to anyone intercepting the connection. FTP should not be used over public networks without encryption. SFTP (SSH File Transfer Protocol) – a completely separate protocol that provides file transfer over an SSH connection; encrypted and secure; commonly used for accessing web server files, connecting to NAS devices remotely, and transferring sensitive files. Runs over port 22. SCP (Secure Copy Protocol) – simpler encrypted file transfer over SSH; used primarily for copying single files via command line. FTPS (FTP Secure) – the original FTP with SSL/TLS encryption added; different from SFTP; uses ports 21 and a range of data ports. Popular FTP/SFTP clients: FileZilla (free, cross-platform), Cyberduck (Mac/Windows), WinSCP (Windows). For most everyday file sharing between home computers, network drives (SMB) or cloud storage are more practical than FTP. See also: SSH, Encryption, Protocol, Web Hosting.
Game Controller / Gamepad / Joystick
A game controller is an input device designed specifically for video gaming, providing analogue sticks, buttons, triggers, and a directional pad (D-pad) in an ergonomic handheld form. The most common controllers are the Xbox Wireless Controller (compatible with Xbox consoles and Windows PCs via Bluetooth or USB) and the PlayStation DualSense / DualShock 4 (PS5/PS4, also compatible with PC). Controllers connect via USB cable, USB wireless dongle, or Bluetooth. A joystick is an older flight-simulation controller consisting of a vertical stick mounted on a base with buttons. Modern flight sticks by brands like Thrustmaster and Logitech are used in flight simulation games. See also: USB, Bluetooth, GPU.
Gaming Peripherals (Headset / Chair / Desk Setup)
Gaming peripherals are specifically designed hardware optimised for competitive and extended gaming sessions: Gaming headset – the primary audio device for gaming; features: 7.1 virtual surround sound (positional audio); noise-cancelling microphone (critical for team communication); comfortable ear cushions for long sessions; wired (lower latency) vs wireless (freedom of movement). Popular brands: SteelSeries, HyperX, Corsair, Razer, Logitech G. Gaming chair – designed for extended sitting with adjustable lumbar and neck support; racing-style seats are popular aesthetically but often lack proper ergonomics; high-quality alternatives like Herman Miller and Secretlab prioritise ergonomics over aesthetics. Gaming desk – height-adjustable desks (sit-stand) benefit all computer users including gamers; cable management is a key consideration for multi-peripheral setups. Capture card – for recording or streaming console gameplay to a PC; popular brands: Elgato, AVerMedia. The best gaming setup also considers lighting (avoid glare on screen), cooling, and cable management. See also: Headphones, Mouse DPI, Mechanical Keyboard Switches, GPU.
GDPR / International Privacy Law
The GDPR (General Data Protection Regulation) is the European Union’s comprehensive data protection law, effective since May 2018. While primarily an EU law, it has global impact because it applies to any organisation handling data of EU residents, regardless of where the organisation is based. Key GDPR principles: lawful basis for processing; data minimisation; purpose limitation; accuracy; storage limitation; integrity and confidentiality; and accountability. GDPR penalties are severe: up to €20 million or 4% of global annual turnover. Non-EU countries like Australia, Canada, Japan, and the UK have enacted similar laws (Australia’s Privacy Act is currently being reformed to add GDPR-like provisions). The CCPA (California Consumer Privacy Act) provides similar rights for California residents in the US. Understanding these laws is essential for any Australian business handling data of international customers. See also: Privacy Act, Cookie, Data Breach, Metadata.
Generative AI
Generative AI refers to AI systems that can create new content – text, images, audio, video, code, 3D models, and more – rather than simply classifying or analysing existing data. The most prominent generative AI tools include: Text: ChatGPT (OpenAI), Claude (Anthropic), Gemini (Google); Image: DALL·E 3, Midjourney, Stable Diffusion, Adobe Firefly; Video: Sora (OpenAI), Runway, Pika; Audio/Voice: ElevenLabs, Suno; Code: GitHub Copilot, Cursor, Windsurf. Generative AI is powered by Large Language Models and diffusion models trained on vast datasets. It is transforming industries including marketing, software development, design, education, legal, and healthcare at extraordinary speed. See also: Artificial Intelligence, Large Language Model (LLM), AI Chatbot, Deepfake.
Geofencing
Geofencing is a location-based technology that creates a virtual geographic boundary (a “fence”) around a real-world area. When a device with location services enabled (smartphone, vehicle GPS, IoT sensor) enters or exits the defined zone, it triggers an automatic action or notification. Geofencing applications include: retail marketing (send a coupon when a customer walks past a store); fleet management (alert when a company vehicle leaves a defined area); smart home automation (unlock the front door when you arrive home); parental controls (receive an alert when a child’s phone leaves the school grounds); and workplace access control. Geofencing uses GPS, Wi-Fi, cellular triangulation, or a combination. See also: IoT, GPS, Smart Home.
Gigabyte – What Does It Mean for Regular Users?
For technophobes, storage and data measurements can be confusing. Here is a practical guide: 1 MB (Megabyte) – roughly one photo taken on a modern smartphone; a short Word document. 1 GB (Gigabyte) – approximately 250 smartphone photos; a standard-definition movie; about 1 hour of music. 1 TB (Terabyte) – approximately 250,000 photos; 500 hours of HD video; a modern laptop’s worth of storage. In terms of internet data: streaming Netflix in Standard Definition uses about 1 GB/hour; HD uses about 3 GB/hour; 4K uses about 7 GB/hour. Typical NBN plan setup and installation include monthly data quotas ranging from 50 GB (for light users) to truly unlimited. See also: Byte, Cloud Backup, NBN, Streaming.
Git / Version Control
Git is the world’s most widely used version control system – software that tracks every change made to code (or any text file) over time, maintaining a complete history. Git allows multiple developers to work on the same codebase simultaneously, merge their changes, and revert to any previous state if something breaks. GitHub, GitLab, and Bitbucket are popular cloud platforms that host Git repositories and add collaboration features (pull requests, code review, issue tracking). Key concepts: commit (a saved snapshot of changes); branch (an independent line of development); merge (combining changes from different branches); pull request (requesting that your changes be merged into the main codebase). While Git is primarily a developer tool, version control principles apply anywhere files are repeatedly modified – some document management systems use similar concepts. See also: Open Source Software, Cloud Computing.
Google Business Profile (Google My Business)
Google Business Profile (formerly Google My Business) is a free tool that allows businesses to manage their presence in Google Search and Google Maps. When someone searches for your business name or a relevant service in your area (e.g., “computer repairs near me”), your Google Business Profile shows your hours, phone number, address, reviews, photos, and a website link. It is the digital marketing setup for Australian businesses for local businesses. Key elements to complete: business name, category, address, service area, phone number, website, hours (including special hours for public holidays), business description, photos (interior, exterior, team), and services/products. Responding to Google Reviews – both positive and negative – is important for reputation management. Google Posts allow you to share updates, offers, and events. For service businesses like The Original PC Doctor, Google Business Profile drives a significant proportion of local search traffic. See also: SEO, CMS, Web Analytics.
Google Play Protect
Google Play Protect is Android’s built-in malware protection service that continuously scans all apps on your device – including apps downloaded outside the Play Store – and compares them against Google’s cloud-based malware database. It scans over 125 billion apps daily across all Android devices globally. Play Protect also: warns before installing apps from unknown sources; checks apps for harmful behaviour even after installation; remotely disables known dangerous apps; and provides a device security status summary. Checking Play Protect status: Google Play Store > Profile icon > Play Protect. professional virus and malware removal but can be disabled (something malware may attempt). One significant limitation: Play Protect cannot scan apps on devices with Google services removed (e.g., Huawei phones sold after US sanctions). When purchasing an Android phone, ensure it includes Google services and Play Protect support. See also: Android Security, Malware, Phone Security Checklist.
Google Workspace
Google Workspace (formerly G Suite) is Google’s cloud-based productivity suite competing directly with Microsoft 365. Applications: Gmail (email); Google Drive (cloud storage); Google Docs (word processing); Google Sheets (spreadsheets); Google Slides (presentations); Google Calendar; Google Meet (video conferencing); Google Chat (messaging); Google Forms; and Google Sites. Key advantages over Microsoft 365: superior real-time collaboration (multiple people editing simultaneously with changes visible instantly); entirely browser-based (no installation required); powerful search; and seamless Android integration. Disadvantages: fewer advanced features in Docs/Sheets than Word/Excel for complex documents; requires constant internet connection for full functionality. Pricing: Business Starter ($9.36 AUD/user/month); Business Standard ($18.72); Business Plus. Google Workspace is popular with startups, education, and smaller businesses; Microsoft 365 dominates large enterprises. See also: Cloud Computing, SaaS, Microsoft 365, Video Conferencing.
GPS (Global Positioning System)
GPS is a satellite-based navigation system operated by the United States Department of Defense that provides accurate location, navigation, and timing information to any GPS-enabled receiver anywhere on Earth. Your smartphone, smartwatch, car navigation system, fitness tracker, and many cameras include GPS receivers. GPS works by receiving signals from multiple satellites (at least four) and calculating your position by measuring the precise time differences between those signals. Accuracy: smartphone GPS is typically accurate to 3–5 metres in clear conditions. In cities with tall buildings, accuracy degrades (urban canyon effect). A-GPS (Assisted GPS) uses mobile network and Wi-Fi data to speed up the time to first fix (how long it takes to get a GPS lock). Apps like Google Maps, Apple Maps, and Waze rely on GPS combined with map data and real-time traffic. See also: IoT, Wearable Technology, Geofencing.
GPU (Graphics Processing Unit)
A GPU is a specialised processor originally designed to rapidly render graphics for video games and video – handling the complex calculations needed to display millions of pixels at high frame rates. Unlike a CPU (which has a small number of powerful cores optimised for sequential tasks), a GPU contains thousands of smaller, simpler cores designed for parallel processing – performing many calculations simultaneously. This parallel architecture makes GPUs extraordinarily powerful for tasks beyond graphics: AI and machine learning model training, cryptocurrency mining, scientific simulation, video encoding, and 3D rendering. NVIDIA (GeForce, RTX series) and AMD (Radeon) are the leading consumer GPU manufacturers. NVIDIA’s H100 and Blackwell series GPUs are the dominant hardware for large-scale AI training, commanding prices of tens of thousands of dollars each. See also: CPU, Deep Learning, AI Computing, Artificial Intelligence.
Green IT / Sustainable Computing
Green IT refers to the practice of designing, manufacturing, using, and disposing of computing technology in an environmentally responsible and resource-efficient manner. Key aspects include: energy-efficient hardware design (processors, power supplies, data centres); virtualisation and cloud computing (consolidating workloads to reduce physical server count); renewable energy-powered data centres (major cloud providers including AWS, Google, and Microsoft have committed to 100% renewable energy); e-waste recycling programs; and extending the lifespan of devices through repair rather than replacement. The global data centre industry consumes roughly 1–2% of global electricity. Choosing energy-efficient laptops (look for Energy Star ratings), enabling sleep/hibernate modes, and using cloud services powered by renewable energy all contribute to a smaller digital carbon footprint. See also: E-Waste, Cloud Computing, Virtualisation.
Group Policy
Group Policy is a powerful Windows feature (available in Pro, Enterprise, and Education editions) that allows administrators to business IT management services and restrictions across Windows computers – either a single computer (Local Group Policy) or many computers in a domain (Active Directory Group Policy). Settings range from: enforcing password complexity requirements and account lockout policies; blocking access to Control Panel, USB storage, or specific applications; configuring Windows Update behaviour; forcing screensaver lockout; restricting what users can install; and deploying software across an organisation. Group Policy settings override individual user preferences and are applied at system startup or login. Accessing Local Group Policy: Windows key + R, type “gpedit.msc” (not available on Home edition). See also: Active Directory, User Account, Managed IT Services, Windows Versions.
GST / BAS (Business Activity Statement)
GST (Goods and Services Tax) is Australia’s 10% broad-based consumption tax that applies to most goods, services, and other supplies. Businesses with annual turnover of $75,000 or more must register for GST with the ATO, charge GST on taxable supplies, claim GST credits on business purchases, and remit the net GST collected to the ATO. BAS (Business Activity Statement) is the form businesses use to report and pay their GST, PAYG (Pay As You Go) withholding tax, PAYG income tax instalments, and other tax obligations. BAS is lodged quarterly or monthly via the ATO’s online services, accounting software (Xero, MYOB, QuickBooks), or through a registered BAS agent. The ATO’s Single Touch Payroll system has automated much of payroll reporting, simplifying BAS lodgement for businesses with employees. See also: ATO Digital Services, Cloud Computing, SaaS.
Guest Network
A guest network is a separate, isolated Wi-Fi network provided by your router alongside your main home or office network. Devices connected to the guest network can access the internet but cannot communicate with devices on the main network (computers, NAS drives, printers). Uses: providing internet access to visitors without sharing your Wi-Fi password or network access; isolating IoT devices (smart TVs, smart speakers, robot vacuums) from computers and sensitive data; and segmenting BYOD (Bring Your Own Device) employee devices from company computers. Setting up a guest network is professional network setup and security for any home or small business network. Most modern routers support at least one guest network through the admin interface. See also: Router, Wireless Network, IoT, VLAN.
Hallucination (AI)
AI hallucination refers to the phenomenon where a language model generates content that sounds confident and plausible but is factually incorrect, fabricated, or nonsensical. The term comes from the way these outputs superficially resemble real knowledge while being disconnected from reality – like a vivid dream that feels real. Hallucinations can include: fabricated citations and research papers that don’t exist; invented facts, statistics, or quotes; fictitious case law or legislation; and plausible-sounding but incorrect technical information. Hallucination occurs because LLMs predict the most statistically likely next token given training data – they don’t truly “know” facts, they model patterns in language. Mitigation strategies include: RAG (grounding responses in retrieved documents), fine-tuning on domain-specific data, prompt engineering, and building verification steps into AI workflows. professional IT consultancy by humans. See also: Large Language Model (LLM), RAG, Generative AI.
Hard Drive (HDD)
A Hard Disk Drive (HDD) is a traditional mechanical storage device that uses spinning magnetic platters and a read/write head to store and retrieve data. HDDs are measured in terabytes (TB) and offer large storage capacities at low cost (typically $20–$40 AUD per terabyte). However, they are significantly slower than SSDs, more susceptible to damage from drops and vibration (due to moving parts), noisier, heavier, and consume more power. what to do when a hard drive fails for bulk secondary storage (external backup drives, NAS devices, desktop secondary drives) where cost per gigabyte is the priority over speed. For primary operating system drives in any modern laptop or desktop, an SSD is strongly recommended. See also: SSD, NVMe SSD, Cloud Backup, RAID.
Hardware vs Software
The most fundamental distinction in computing: Hardware refers to the physical, tangible components of a computer that you can touch – the screen, keyboard, mouse, the circuit boards inside, the hard drive, and the power supply. If you can physically pick it up, drop it, or break it, it is hardware. Software refers to the programs and data that run on the hardware – the operating system, Microsoft Word, your web browser, a game, a mobile app, or a photo. Software cannot be touched; it exists as data stored on the hardware. A helpful analogy: a book is hardware; the story written in it is software. When your computer has a problem, identifying whether it is a our computer repair diagnosis service is the starting point for any diagnosis. See also: App / Application, Operating System, Computer.
HDMI (High-Definition Multimedia Interface)
HDMI is the standard digital cable and connector interface used to transmit high-definition audio and video signals between devices – computers, TVs, monitors, projectors, gaming consoles, streaming sticks, and Blu-ray players. A single HDMI cable carries both audio and video signals. Key HDMI versions: HDMI 1.4 (supports 1080p/120fps and 4K/30fps); HDMI 2.0 (4K/60fps, HDR); HDMI 2.1 (4K/120fps, 8K/60fps, variable refresh rate – essential for modern gaming TVs and monitors). Mini HDMI and Micro HDMI are smaller connector variants used on some laptops, cameras, and tablets. See also: DisplayPort, Monitor, 4K / 8K Resolution, Thunderbolt / USB-C.
HDMI ARC / eARC
ARC (Audio Return Channel) is a feature of HDMI that allows audio to travel in both directions over a single HDMI cable – from the TV back to a soundbar or AV receiver, without needing a separate optical cable. This simplifies home theatre setups: one HDMI cable between TV and soundbar handles both picture (TV output to soundbar display passthrough) and audio (TV audio back to soundbar). eARC (Enhanced Audio Return Channel), introduced with HDMI 2.1, dramatically increases ARC bandwidth to support uncompressed multi-channel audio (Dolby TrueHD, DTS:X Master Audio) and high-bitrate Dolby Atmos – something the original ARC couldn’t handle. To use eARC, both the TV and soundbar/receiver must have HDMI 2.1 ports with eARC support, connected with a Premium High Speed HDMI cable. See also: HDMI, Dolby Atmos, Smart TV.
HDR (High Dynamic Range)
High Dynamic Range (HDR) technology enables displays to show a wider range of colours and a greater difference between the darkest shadows and brightest highlights than standard (SDR) displays, producing more vivid, lifelike images. HDR standards include: HDR10 – the baseline open standard, widely supported; HDR10+ – adds dynamic metadata for scene-by-scene optimisation; Dolby Vision – the premium standard, requires licensing, supported by Netflix, Disney+, and Apple; HLG (Hybrid Log-Gamma) – developed for broadcast TV. For HDR to work end-to-end, the content must be mastered in HDR, the connection must support it (HDMI 2.0+), and the display must be HDR-capable with sufficient peak brightness (typically 400–1000+ nits). Most modern TVs, monitors, iPhones, and streaming content now support some form of HDR. See also: OLED, 4K / 8K Resolution, Monitor, Streaming.
Head Crash
A head crash is a catastrophic mechanical failure in a hard disk drive (HDD) where the read/write head makes direct contact with the spinning magnetic platter surface. Normally, the read/write head “flies” on a cushion of air just nanometres above the platter surface. When a head crash occurs – typically due to physical shock (dropping a laptop), contamination (dust particle), head actuator failure, or bearing failure – the head scrapes the platter, destroying the magnetic coating and the data stored there, often creating debris that causes further damage. Head crashes are audible (a learn more about mechanical hard drive failures) and are considered one of the most severe forms of drive failure. professional hard drive data recovery, a donor drive for parts replacement, and specialist expertise. The sooner the drive is powered off after a crash, the more data may be salvageable. See also: Cleanroom, Data Recovery, Click of Death, Donor Drive.
Headphones / Headset
Headphones are audio output devices worn over or in the ears for private listening. Types: Over-ear (circumaural) – cups surround the ear completely; most comfortable for long use, best sound isolation; On-ear (supra-aural) – cups rest on the ear; more compact; In-ear (earbuds/IEMs) – fit inside the ear canal; most portable. Active Noise Cancellation (ANC) uses microphones and electronics to actively cancel ambient sound. A headset adds a built-in microphone, making it suitable for phone calls, video conferencing, gaming, and voice input. Connection types: USB (for teams calls, digital audio), 3.5mm audio jack (analogue, universal), Bluetooth (wireless). See also: Microphone (Peripheral), USB, Bluetooth, VoIP.
Help Desk / IT Ticketing System
A help desk (or service desk) is the central point of contact for reporting IT problems and requesting services within an organisation. When a staff member’s email stops working or their computer needs software installed, they contact the help desk. IT ticketing systems track each request as a “ticket” – recording who reported the issue, what was done, how long it took, and when it was resolved. Popular help desk platforms: Jira Service Management, Zendesk, ServiceNow (enterprise), Freshdesk, and HubSpot Service Hub. Ticketing systems help IT teams: prioritise urgent issues; avoid losing track of requests; measure performance (response time, resolution time); identify recurring problems; and build a knowledge base of solutions. See also: our managed IT and help desk services, Remote Desktop, SLA.
Hex Editor
A hex editor is a specialised software tool that displays and allows editing of the raw binary data of a file or storage device in hexadecimal format (a number system using digits 0–9 and letters A–F). Hex editors are used in data recovery and digital forensics to: examine the raw contents of damaged files; identify and repair file header corruption; manually reconstruct files when automated tools fail; identify file types in unformatted disk areas; analyse malware; and perform low-level disk editing. Common hex editors include HxD (Windows, free), 010 Editor, and WinHex. Using a hex editor requires deep technical knowledge – incorrect edits can permanently destroy recoverable data. See also: Data Carving, Data Recovery, Forensic Imaging.
Zigbee / Z-Wave
Two low-power wireless mesh networking protocols widely used for smart home devices, competing with Wi-Fi and Bluetooth for IoT connectivity: Zigbee – open standard (IEEE 802.15.4); operates in 2.4 GHz band; low power consumption; mesh topology allows devices to relay signals; supports thousands of devices per network; widely adopted in smart lighting (Philips Hue), sensors, and switches; requires a hub/coordinator. Z-Wave – proprietary protocol (now managed by Silicon Labs); operates in sub-GHz frequencies (868 MHz in Europe, 908 MHz in US/Australia), which provides better range through walls and less interference from Wi-Fi; maximum 232 nodes per network; requires certified hardware; has strong adoption in security systems. Both protocols are being complemented by the newer Matter/Thread standard. Smart home hubs like SmartThings and Home Assistant support both protocols via USB sticks. See also: Smart Home, IoT, Matter / Thread, Bluetooth.
Homepage
A homepage has two meanings: (1) The main landing page of a website – the first page visitors see when they go to a website address (e.g., thepcdoctor.com.au). Every website has a homepage as its entry point. (2) The page your browser automatically opens when you launch it or click the Home button. You can set any website as your browser’s homepage in the browser’s settings. Popular choices include Google, a news site, or a customised new tab page. See also: Browser, Domain Name / URL.
Hotspot / Mobile Hotspot
A hotspot is a location where internet access is provided wirelessly, typically via Wi-Fi. Public hotspots are available in cafes, airports, hotels, libraries, and shopping centres – often free but requiring caution as public Wi-Fi is inherently less secure than private networks (use a VPN on public Wi-Fi). A mobile hotspot (also called tethering) allows you to share your smartphone’s 4G/5G mobile data connection as a Wi-Fi network for other devices – useful when working remotely, travelling, or when home internet is unavailable. Dedicated mobile hotspot devices (Wi-Fi “MiFi” dongles) use a SIM card and operate as standalone portable Wi-Fi routers. Be aware that using a mobile hotspot can consume your mobile data allowance quickly, particularly for video streaming or large downloads. See also: Wi-Fi, VPN, 5G, NBN.
HTML / CSS / JavaScript
These three technologies form the foundation of every website and web application: HTML (HyperText Markup Language) is the structural layer – it defines the content and elements of a webpage (headings, paragraphs, images, links, forms). CSS (Cascading Style Sheets) is the presentation layer – it controls how HTML elements look (colours, fonts, layout, spacing, animations). JavaScript (JS) is the behaviour layer – it makes web pages interactive and dynamic (dropdown menus, form validation, real-time updates, animations, single-page applications). Together, HTML/CSS/JS are executed by your web browser to render the web pages you see. Modern web development builds on these fundamentals with frameworks like React, Vue, and Angular (JavaScript), Tailwind (CSS), and backend languages like Python, PHP, and Node.js for server-side logic. See also: Browser, Web Hosting, API.
HTTPS / SSL / TLS
HTTPS (HyperText Transfer Protocol Secure) is the secure version of HTTP, encrypting data exchanged between your browser and a web server. It uses TLS (Transport Layer Security) – the modern, more secure replacement for the now-deprecated SSL (Secure Sockets Layer). A padlock icon in your browser’s address bar indicates an HTTPS connection. HTTPS protects login credentials, payment information, and personal data from being intercepted by third parties on the same network. It also prevents tampering with page content in transit. Google uses HTTPS as a ranking signal, meaning HTTPS websites rank higher in search results than HTTP-only sites. A Digital Certificate (also called SSL Certificate) issued by a trusted Certificate Authority (CA) is what enables HTTPS. Free certificates are available through Let’s Encrypt. Never enter passwords or payment details on a website that lacks HTTPS. See also: Encryption, Cybersecurity, VPN, Domain Name.
Hyperlink / Link
A hyperlink (or simply “link”) is a clickable element – usually underlined text or an image – that, when clicked, takes you to another web page, document, section of the same page, or triggers a download. Links are the foundation of how the web works, allowing navigation between billions of interconnected pages. In web browsers, links are typically shown in blue and turn purple after you have visited them (though websites can style links in any colour). Hovering over a link (without clicking) shows the destination URL in the browser’s status bar at the bottom of the window – a useful habit for checking where a link goes before clicking, especially to spot phishing links. See also: Browser, Phishing, HTTPS.
Hypervisor / Virtualisation
See: Virtualisation.
IAM (Identity and Access Management)
Identity and Access Management is the framework of policies, processes, and technologies that ensures the right people (and only the right people) have the right access to the right resources at the right time. IAM encompasses: Authentication (verifying who you are – password, MFA, biometrics); Authorisation (determining what you are allowed to do – role-based access control); Provisioning (creating and configuring user accounts when someone joins); De-provisioning (removing access when someone leaves – critical, as business IT security services); Single Sign-On (SSO) (one login credential for multiple systems); and Privileged Access Management (PAM) (securing and auditing administrator-level accounts). IAM is a cornerstone of zero-trust security. See also: Zero Trust Security, Active Directory, Multi-Factor Authentication.
iCloud (Apple Cloud Services)
iCloud is Apple’s cloud platform providing storage, synchronisation, and services across all Apple devices (iPhone, iPad, Mac, Apple Watch, Apple TV). Key iCloud services: iCloud Drive – file storage accessible from all devices and iCloud.com; iCloud Photos – full-resolution photos and videos synchronised across devices; iCloud Backup – automatic daily backup of iPhone and iPad over Wi-Fi; iCloud Keychain – password and passkey synchronisation across Apple devices (Apple’s built-in password manager); iCloud Mail; Messages in iCloud; Find My; and Family Sharing. Free storage is 5GB (quickly filled by photos and device backups); paid plans: 50GB ($1.49/month), 200GB ($4.49/month), 2TB ($14.99/month) in Australia. Important: iCloud sync is not a backup – deleting a photo on one device deletes it everywhere. Use iCloud Backup (separate to iCloud Drive) and professional data recovery and backup setup like Backblaze. See also: Apple ID, Cloud Backup, Cloud Sync.
Icon
An icon is a small graphical image that represents a program, file, folder, device, or action on a computer screen. Icons make computers visually intuitive – instead of typing commands, you click the relevant picture. Common icons include: the Recycle Bin (a bin/trash can for deleted files); the Wi-Fi signal bars in the taskbar; the battery indicator on a laptop; program icons on the desktop or taskbar; and file type icons (a W for Word documents, an X for Excel). Desktop icons are typically shortcuts – double-clicking them opens the program or file they represent. See also: Desktop (UI), Shortcut, Taskbar.
IDE (Integrated Development Environment)
An Integrated Development Environment is a software application that provides a comprehensive environment for writing, editing, testing, and debugging code. An IDE combines: a code editor (with syntax highlighting, code completion, and formatting); a compiler or interpreter (to run the code); a debugger (to step through code and inspect variables); and often version control integration, project management, and plugin ecosystems. Popular IDEs include Visual Studio Code (VS Code – the most popular, free, from Microsoft); JetBrains products (IntelliJ IDEA for Java, PyCharm for Python, WebStorm for JavaScript); Xcode (Apple, for iOS/macOS development); and Android Studio (for Android apps). See also: Bug / Debugging, Programming Language, Open Source Software.
Identity Theft
Identity theft occurs when someone uses your personal information – name, date of birth, address, Tax File Number, Medicare number, driver’s licence, or passport details – without your consent to commit fraud. Common uses: opening new credit accounts or loans in your name; filing fraudulent tax returns claiming your refund; taking over existing bank or investment accounts; obtaining government benefits; committing crimes under your identity. In Australia, identity crime costs over $3.1 billion annually. After a data breach or scam, act immediately: Contact your bank; Report to IDCARE (1800 595 160, idcare.org) – Australia’s specialist identity recovery service; Consider a credit freeze or alert via credit bureaus (Equifax, illion, Experian); Report to the police and get a report number for financial institution investigations; Contact government agencies if government document details were compromised (Services Australia, ATO). Prevention: shred documents with personal information; use different strong passwords for every account; enable MFA on financial accounts; monitor your credit report annually (free via CreditSmart). See also: Data Breach, Scamwatch, Multi-Factor Authentication (MFA), Dark Web.
IDS / IPS (Intrusion Detection/Prevention System)
An Intrusion Detection System (IDS) monitors network traffic and system activity for suspicious patterns that may indicate a cyberattack or policy violation, generating alerts when potential threats are detected. An Intrusion Prevention System (IPS) goes further – it actively blocks detected threats in real time, not just alerting but acting. Network IDS/IPS (NIDS/NIPS) analyse traffic traversing the network. Host-based IDS/IPS (HIDS/HIPS) monitor activity on individual computers. Detection methods: Signature-based (matching against known attack patterns – fast but misses zero-days); Anomaly-based (detecting deviation from baseline behaviour – catches novel attacks but generates more false positives). Modern professional network security setup (Palo Alto, Fortinet, WatchGuard) typically include integrated IPS functionality. See also: Firewall, Zero-Day Vulnerability, Cybersecurity.
IMAP / POP3 / SMTP (Email Protocols)
These are the standard protocols that govern how email is sent, received, and stored: SMTP (Simple Mail Transfer Protocol) is used to send outgoing email from your device to mail servers, and between mail servers. IMAP (Internet Message Access Protocol) is the preferred protocol for receiving email – it leaves messages on the mail server and synchronises your email across multiple devices (your emails appear the same whether you check from a phone, laptop, or tablet). POP3 (Post Office Protocol 3) downloads emails to one device and typically removes them from the server – useful if you only use one device but problematic if you access email from multiple devices. Most modern professional email setup and support (Outlook, Apple Mail, Thunderbird) default to IMAP. Webmail services like Gmail and Outlook.com handle all protocols transparently. See also: Protocol, Cloud Computing, Spam.
IMEI Number (International Mobile Equipment Identity)
The IMEI is a unique 15-digit identifier assigned to every mobile phone and cellular-connected tablet at manufacture. Like a serial number, no two devices share the same IMEI. The IMEI is used by carriers to identify devices on their networks, and can be used to block a stolen phone from connecting to any network worldwide (IMEI blacklisting). To find your IMEI: dial *#06# on any phone; look in Settings > About; or check the original box. Always record your IMEI before your phone is lost or stolen and report it to your carrier immediately if the device is stolen. In Australia, report stolen phones to the ACMA (Australian Communications and Media Authority) for IMEI blacklisting. See also: SIM Card, Biometrics.
iMessage / RCS / Messaging Security
Understanding messaging security helps protect private communications: iMessage – Apple’s messaging system (blue bubbles); end-to-end encrypted between Apple devices; messages stored in iCloud are encrypted but Apple holds the key unless Advanced Data Protection is enabled; SMS / RCS – standard carrier-based messaging; SMS has no encryption; RCS (Rich Communication Services) – the modern SMS replacement standard supported by Google Messages on Android and iOS 18; provides end-to-end encryption for RCS chats; better than SMS but dependent on carrier support. Signal – the gold standard for secure messaging; open-source; end-to-end encrypted by default for all messages and calls; recommended by security experts globally; phone number required but can be hidden behind a username. WhatsApp – end-to-end encrypted for messages (uses Signal protocol); metadata collected by Meta. For highly sensitive conversations, online privacy and messaging security advice over other platforms. See also: Encryption, iPhone Security, Privacy.
Incident Response
Incident response (IR) is the structured process an organisation follows to prepare for, detect, contain, eradicate, and recover from cybersecurity incidents – and learn from them to prevent recurrence. The NIST incident response lifecycle has four phases: Preparation – developing IR plans, playbooks, communication trees, and training staff before an incident occurs; Detection and Analysis – identifying that an incident has occurred, determining its scope, and classifying its severity; Containment, Eradication, and Recovery – stopping the spread (isolating affected systems), removing the threat (malware, unauthorised access), and restoring systems from clean backups; Post-Incident Activity – conducting a blameless post-mortem, updating procedures, and notifying regulators and affected parties as required (NDB scheme). professional incident response and virus removal guidance. See also: Cybersecurity, ACSC, SIEM, Ransomware Recovery.
Infrastructure as Code (IaC)
Infrastructure as Code is the practice of managing and provisioning computing infrastructure (servers, networks, databases, load balancers) through machine-readable configuration files rather than manual processes. With IaC, you write code that describes your desired infrastructure state, and tools automatically create, configure, and manage the resources. Popular IaC tools include: Terraform (multi-cloud, most widely used); AWS CloudFormation (AWS-specific); Ansible (configuration management); and Pulumi (uses general-purpose programming languages). Benefits: infrastructure changes are version-controlled, auditable, and reproducible; environments (development, testing, production) are consistent; and spinning up a complete environment takes minutes rather than days. See also: Cloud Computing, DevOps, Git / Version Control.
Internet Speed Test
An internet speed test measures your actual internet connection performance at a given moment, checking three key metrics: Download speed (Mbps) – how fast data travels from the internet to your device; what most activities (streaming, browsing, downloading) depend on. Upload speed (Mbps) – how fast data travels from your device to the internet; important for video calls, cloud backups, live streaming, sending large files. Latency/Ping (ms) – the round-trip delay; critical for gaming and video calls but less important for general browsing. Popular speed test tools: Speedtest.net (Ookla – most widely used); Fast.com (Netflix’s tool – focuses on realistic streaming speed); Cloudflare Speed Test (speed.cloudflare.com – also measures latency and jitter). For accurate results: test while wired directly to the router (not Wi-Fi); close other apps; test at different times of day (evening peak hours are typically slower). Compare your results to your plan’s promised speeds – NBN speed troubleshooting guide of advertised download, contact your ISP. See also: Bandwidth, NBN, Latency, NBN Speed Tiers.
Investment Scam / Crypto Scam
Investment scams are Australia’s highest-loss scam category, with victims losing an average of $67,000 each in 2023. Types: Fake trading platforms – victims are directed to professional-looking investment websites that are entirely fraudulent; initial “profits” are shown to encourage more investment; when victims try to withdraw, they are asked to pay “taxes” or “fees” (also stolen), then the platform disappears; Superannuation scams – fraudsters encourage early super release through fake structures or impersonate super funds; Property investment fraud – fake seminars and mentoring programs selling overpriced properties with fabricated returns; Cryptocurrency pump-and-dump – coordinated promotion of low-value coins inflating the price; creators sell at peak leaving late buyers with losses; ICO scams (Initial Coin Offerings) – fake new cryptocurrency launches. Warning signs: promises of guaranteed high returns; unregistered investment platforms; pressure to invest quickly; contact initiated through social media or dating apps; requests to keep investment secret from family. Always verify investment platforms on ASIC’s register (asic.gov.au/check). See also: Cryptocurrency, Romance Scam, Scamwatch, Online Scam Types.
IoT (Internet of Things)
The Internet of Things refers to the ever-growing network of physical devices embedded with sensors, software, and internet connectivity that can collect and exchange data. IoT spans an enormous range: consumer devices (smart speakers like Amazon Echo and Google Nest, smart thermostats, video doorbells, connected appliances, robot vacuums); industrial IoT (manufacturing sensors, supply chain tracking, predictive maintenance systems); agricultural IoT (soil moisture sensors, smart irrigation); healthcare IoT (remote patient monitoring, connected medical devices); and smart city infrastructure (connected traffic lights, parking sensors, waste management). IoT devices often create cybersecurity risks – many ship with default passwords or lack security update mechanisms. Change default passwords on all IoT devices immediately after setup. See also: Smart Home, 5G, Edge Computing, Cybersecurity.
IP Addressing
An IP (Internet Protocol) address is a unique numerical label assigned to every device on a network. IPv4 addresses use four groups of numbers (e.g., 192.168.1.1) and have been the standard since the 1980s. Because the total pool of approximately 4.3 billion IPv4 addresses has been exhausted, IPv6 was developed with a vastly larger space of 340 undecillion unique addresses, using eight groups of four hexadecimal digits (e.g., 2001:0db8:85a3::8a2e:0370:7334). Private IP addresses (like 192.168.x.x and 10.x.x.x) are used within your local network; Public IP addresses are assigned by your ISP and are visible to the internet. DHCP (Dynamic Host Configuration Protocol) automatically assigns IP addresses to devices on a network. Static IP addresses are manually assigned and don’t change – important for servers, printers, and network cameras. See also: DNS, Router, Network.
IP Camera / Security Camera (CCTV)
An IP (Internet Protocol) camera is a digital security camera that transmits video data over an IP network (wired Ethernet or Wi-Fi) rather than through analogue coaxial cable. Unlike older analogue CCTV cameras, IP cameras: offer much higher resolution (2MP/1080p up to 4K and beyond); connect directly to your home network; can be accessed and viewed remotely via smartphone app; and can store recordings locally (on a microSD card, NAS, or NVR) or to the cloud. Key specs to consider: resolution (4MP/2K is the sweet spot for most homes); night vision (infrared range); field of view (wider = covers more area); weatherproofing (IP65/IP66/IP67 rating for outdoor use); local vs cloud storage; and two-way audio. Australian privacy consideration: cameras pointing onto public footpaths or neighbouring properties can raise legal issues; cameras in private spaces (bathrooms, bedrooms) are illegal. Popular brands: Hikvision, Dahua, Reolink, Axis (enterprise), Arlo, Ring, and Eufy (consumer). IP camera and security system setup – they are frequently targeted by hackers. See also: NVR / DVR, IoT, NAS, Smart Home.
iPhone Security Features
iOS includes extensive security features that make iPhones among the most secure consumer devices available: App Store vetting – Apple reviews every app before listing (though some malicious apps occasionally slip through); App sandboxing – each app runs in isolation and cannot access other apps’ data; Face ID / Touch ID – hardware-secured biometric authentication using the Secure Enclave; Secure Enclave – a separate processor handling encryption keys, biometrics, and payments, isolated from the main CPU; End-to-end encrypted iMessage and FaceTime; Private Relay (iCloud+ subscribers) – a two-hop privacy relay preventing both Apple and network observers from knowing both your identity and what sites you visit; Hide My Email (iCloud+) – generates random email addresses to protect your real address; iPhone and Mac security services – extreme protection for high-risk users (journalists, activists) that disables many features to dramatically reduce attack surface; Stolen Device Protection (iOS 17.3+) – requires biometric authentication (not passcode) for sensitive actions when the phone is away from trusted locations. See also: Activation Lock, Apple ID, End-to-End Encryption.
IPTV (Internet Protocol Television)
IPTV delivers television content over an internet connection rather than through traditional cable, satellite, or over-the-air broadcast signals. Types: Subscription IPTV services – legitimate services like Foxtel Now (later Foxtel / Hubbl), Fetch TV, IPTV channels bundled by NBN providers; Catch-up TV – free, legal services like ABC iview, SBS On Demand, 7plus, 9Now, and 10 play that deliver broadcast content on-demand over the internet; Free-to-air streaming – many set-top boxes and streaming sticks include FTA channel streaming. Illegal IPTV services: unauthorised IPTV services offering hundreds of channels (including pay TV and overseas content) for very low monthly fees are widespread but illegal in Australia; the Australian Federation Against Copyright Theft (AFACT) and rights holders actively pursue these services; users may also expose themselves to malware through unofficial IPTV apps. See also: Streaming, Smart TV, Streaming Stick, Bandwidth.
IPv6 (Internet Protocol Version 6)
IPv6 is the most recent version of the Internet Protocol, developed to address the exhaustion of IPv4 addresses. While IPv4 provides approximately 4.3 billion unique addresses, IPv6 provides 340 undecillion (3.4 × 10³⁸) addresses – enough for every atom on Earth to have its own address. IPv6 addresses are 128 bits long and written in eight groups of four hexadecimal digits (e.g., 2001:db8::1). Benefits beyond address space: built-in IPsec security; simplified routing (no NAT required); autoconfiguration (devices can configure their own IPv6 address); and improved multicast support. IPv6 adoption in Australia is growing but uneven – Telstra, Optus, and Aussie Broadband support it on NBN, but many ISPs and businesses still use IPv4-only infrastructure. See also: IP Addressing, NAT, CGNAT.
ISP (Internet Service Provider)
An ISP is a company that provides access to the internet, typically for a monthly subscription fee based on speed tier and data quota. In Australia, major ISPs include Telstra, Optus, TPG, iiNet, Aussie Broadband, Internode, Belong, Dodo, Superloop, and many others. Most Australian ISPs use the NBN wholesale network as their infrastructure, meaning the physical connection to your home is the same – what differs is customer service, pricing, speed plans, and value-added features. Some ISPs also offer services over 4G/5G mobile networks (suitable for rural areas or as backup). Your ISP typically provides your IP address, email address (though independent providers are recommended), and may also offer bundled phone services. See also: NBN, Broadband, Starlink.
Secure Data Erasure and IT Disposal
When retiring computers, phones, or storage devices, proper data destruction is critical to prevent sensitive information being recovered from discarded equipment. HDDs: software erasure (DBAN, Eraser, Blancco) overwrites all sectors with random data multiple times; a single pass of zeros is sufficient for modern drives (NIST SP 800-88). SSDs and flash storage: standard overwrite tools are less effective due to wear levelling and spare cells; use the drive’s built-in ATA Secure Erase command or NVMe Secure Erase; manufacturer tools (Samsung Magician, Crucial Storage Executive) trigger this. Physical destruction: shredding or drilling through drives guarantees no recovery; required for classified material. Mobile phones: perform factory reset with “Remove all data” option enabled (which triggers encryption key erasure making data unrecoverable on modern phones). Certification: businesses with compliance requirements should use certified IT asset disposal companies providing certificates of destruction. secure data erasure and IT disposal service for businesses and individuals. See also: Data Recovery, E-Waste, Degausser, Encryption.
IT Asset Management (ITAM)
IT Asset Management is the process of tracking, managing, and optimising all technology hardware and software assets throughout their lifecycle – from procurement through deployment, maintenance, and disposal. For businesses, ITAM provides: a complete inventory of all devices (serial numbers, warranty status, assigned users); software licence compliance (avoiding costly licence audits); security visibility (knowing which devices exist and their patch status); budget planning (anticipating refresh cycles); and disposal management (secure data destruction and responsible recycling). Small businesses can start with a simple spreadsheet tracking device type, serial number, purchase date, warranty expiry, user, and software. managed IT services and asset management (Snipe-IT – free, open-source; ServiceNow ITAM; ManageEngine AssetExplorer). IT Asset Disposal (ITAD) companies handle secure certified destruction of drives and responsible recycling when devices are retired. See also: Managed IT Services, E-Waste, MDM, Patch Management.
JSON / XML (Data Formats)
JSON (JavaScript Object Notation) and XML (Extensible Markup Language) are two of the most widely used formats for structuring and transmitting data between systems. JSON uses simple key-value pairs and arrays in a human-readable format, and has become the dominant format for API responses and configuration files due to its simplicity. Example: {"name": "John", "age": 30}. XML uses opening and closing tags (similar to HTML) to create hierarchical data structures. Example: <person><name>John</name></person>. XML is more verbose but more powerful for complex document structures and is still widely used in enterprise systems, SOAP web services, and document formats (Microsoft Office files are actually ZIP archives containing XML). See also: API, HTML / CSS / JavaScript, Cloud Computing.
Keyboard
A keyboard is the primary text input device for a computer, consisting of rows of keys for letters, numbers, punctuation, function keys (F1–F12), and modifier keys (Ctrl, Alt, Shift, Win). Types: Membrane keyboard – common, quiet, affordable, keys have a soft mushy feel; Mechanical keyboard – uses individual switches under each key, providing tactile feedback, longer lifespan, and preferred by many typists and gamers; popular switch types include Cherry MX Red (smooth, quiet), Blue (clicky, tactile), and Brown (tactile, quieter). Scissor-switch keyboards – thin, used in laptops and Apple keyboards. Wireless keyboards connect via Bluetooth or a USB dongle. Layout: Australian keyboards typically use the same layout as UK/International keyboards, which differs slightly from US keyboards (£ symbol placement, Enter key shape). See also: Ergonomic Accessories, USB, Bluetooth, Keyboard Shortcuts.
Keyboard Shortcuts
Keyboard shortcuts are combinations of keys pressed together to perform actions quickly without using the mouse. Learning common shortcuts dramatically speeds up computer use. Essential Windows shortcuts: Ctrl+C = Copy; Ctrl+X = Cut; Ctrl+V = Paste; Ctrl+Z = Undo; Ctrl+Y = Redo; Ctrl+S = Save; Ctrl+P = Print; Ctrl+A = Select All; Ctrl+F = Find; Ctrl+W = Close tab/window; Alt+F4 = Close program; Win+D = Show Desktop; Win+E = Open File Explorer; Win+L = Lock computer; Ctrl+Shift+Esc = Task Manager; PrtScr = Screenshot; Win+Shift+S = Snip screenshot. Mac equivalents use Command (⌘) instead of Ctrl. See also: Copy, Cut, and Paste, Screenshot, Task Manager.
Keylogger
A keylogger is malicious software (or occasionally hardware) that secretly records every keystroke made on a computer or device, capturing passwords, credit card numbers, private messages, and any other typed information. Software keyloggers are installed via malware, phishing, or compromised software. Hardware keyloggers are physical devices plugged between a keyboard and a computer – used in targeted attacks. The captured data is either stored locally (retrieved later) or transmitted to an attacker’s server. Keyloggers are a serious threat because they can capture credentials even when entered on HTTPS websites. Protection includes up-to-date security software, not installing software from untrusted sources, checking unfamiliar USB devices connected to your computer, and using password managers (which auto-fill credentials without typing). See also: Malware, Phishing, Password Manager, Cybersecurity.
Knowledge Management / Wiki
Knowledge management is the process of creating, capturing, organising, sharing, and maintaining an organisation’s collective knowledge so it remains accessible and useful. A central challenge for growing businesses is that knowledge lives in individual people’s heads or siloed in emails and chat threads – leading to repeated questions, inconsistent processes, and knowledge loss when staff leave. Internal wikis and knowledge bases are the primary solution: Confluence (Atlassian), Notion, SharePoint (Microsoft), Guru, and Document360 all provide platforms for documenting processes, policies, onboarding guides, troubleshooting steps, and institutional knowledge. AI-powered knowledge bases can automatically surface relevant articles when support staff or customers ask questions. See also: SaaS, Cloud Computing, Managed IT Services, Help Desk.
KVM Switch (Keyboard, Video, Mouse)
A KVM switch allows a single keyboard, monitor, and mouse to control multiple computers – switching between them with a button press or keyboard shortcut. This is useful when working with multiple computers at a desk without the clutter of multiple keyboards and mice, or in server rooms where a single console manages many servers. USB KVM switches support modern connections; older models used PS/2. HDMI/DisplayPort KVM switches support high-resolution displays. Some KVM switches support sharing USB peripherals (printers, storage drives) in addition to the core keyboard, video, and mouse. See also: Monitor, USB, Server.
LAN (Local Area Network)
A Local Area Network is a network of computers and devices connected within a limited geographic area – typically a single building, floor, or home. Most home and office network setup are LANs. A standard home LAN connects: computers, laptops, smartphones, smart TVs, printers, and IoT devices through a combination of wired Ethernet and wireless Wi-Fi, all managed by the same router/gateway. Key LAN technologies: Ethernet (wired, IEEE 802.3); Wi-Fi (wireless, IEEE 802.11); and increasingly, Power over Ethernet (PoE) for powering cameras and access points. Performance within a LAN (e.g., transferring files between two computers) is limited by your switch/router speed (typically 1 Gbps or 2.5 Gbps) rather than your internet connection. See also: WAN, Network, Ethernet, Wi-Fi 6 / 6E / 7.
Laptop Buying Guide – Key Specs Explained
Buying a laptop is confusing without knowing what the specs actually mean. Here is what matters: Processor (CPU) – Intel Core i5/i7/i9 or AMD Ryzen 5/7/9 for Windows; Apple M-series for Mac. For everyday use, Core i5 or Ryzen 5 is plenty; i7/Ryzen 7 for photo/video editing. RAM – minimum 8GB for Windows 11; 16GB recommended; 32GB for creative work. RAM is often soldered on modern laptops (cannot be upgraded later) – buy enough upfront. Storage – laptop upgrade and repair service (not HDD); 256GB minimum, 512GB recommended. Display – size (13″–16″), resolution (1080p minimum, 1440p better), panel type (IPS for colour accuracy), and brightness (300+ nits for indoor, 400+ nits for outdoors). Battery life – real-world, not marketing claims; 8+ hours for portable use. Ports – check for USB-A, USB-C/Thunderbolt, HDMI; many thin laptops lack full-size ports requiring a hub. Weight – under 1.4kg for ultraportable; 1.4–2kg for everyday; over 2kg for desktop replacement. GPU – for gaming or creative work, a dedicated NVIDIA GeForce or AMD Radeon GPU is needed; integrated graphics is fine for general use. See also: CPU, RAM, SSD, NVMe SSD, GPU, Docking Station.
Laptop Care and Battery Longevity
Laptops last significantly longer with proper care: Battery health: modern lithium batteries perform best when kept between 20–80% charge (avoid consistently draining to 0% or keeping at 100%); many laptops have a “battery care” or “conservation mode” in settings that limits charging to 80%; avoid excessive heat which accelerates battery degradation; see Battery/Battery Health section for health monitoring. Thermal care: never block the ventilation vents (avoid using on beds, pillows, laps for extended periods); use a flat hard surface or laptop stand; clean vents with compressed air every 6–12 months. Screen care: clean with a microfibre cloth slightly dampened with water only – avoid alcohol on anti-glare coatings; close the lid gently; never place anything on top when closed. Keyboard and ports: eat away from the keyboard; compressed air to clean between keys; don’t force USB connectors – align before inserting. Transport: use a padded laptop bag; never leave in a hot car (exceeds safe operating temperature of 35°C quickly). Software health: restart weekly; keep OS and software updated. See also: Battery, Thermal Throttling, Thermal Paste, Computer Maintenance.
Laptop Screen Repair
A broken, cracked, or malfunctioning laptop screen is one of the most common repair requests. Screen failure types: Physical cracking – from dropping or pressure on the lid; visible cracks or black ink bleed; screen must be replaced; Backlight failure – screen appears very dark but image is faintly visible with a torch; LED backlight or inverter failure; Lines or discolouration – vertical or horizontal lines through the image; loose cable or failing panel; Flickering – loose display cable (common when the hinge area is damaged) or driver issue; Dead pixels – individual stuck pixels; a few isolated ones are usually not replaceable under warranty. Repair process: screen replacement involves disassembling the lid, disconnecting the display cable, and installing a compatible replacement panel. Genuine OEM panels maintain original colour accuracy; compatible aftermarket panels vary in quality. Screen replacement typically takes 1–2 hours on most laptop models. The Original PC Doctor technicians carry screen stock for the most common laptop brands and models, enabling same-visit repairs in many cases. See also: Laptop Buying Guide, Computer Insurance, Display Connectors.
Laptop Stand
A laptop stand raises the laptop screen to a more ergonomically appropriate height (eye level), reducing neck strain from looking down at a low screen. Because using a raised laptop requires an external keyboard and mouse for comfortable use, a laptop stand effectively transforms the laptop into a desktop setup. Fixed stands hold the laptop at one angle; adjustable stands offer multiple height and angle settings. Ventilated stands with open designs improve airflow under the laptop, reducing thermal throttling in intensive tasks. Some stands are foldable for portability. Popular brands include Nexstand, Rain Design, Twelve South, and Nulaxy. Pair with a docking station for a complete cable-managed desk setup. See also: Ergonomic Accessories, Docking Station, Monitor.
Latency / Ping
Latency is the time delay in transmitting data across a network, measured in milliseconds (ms). Ping is the most common latency test – sending a tiny packet to a server and measuring the round-trip time. Low latency is critical for real-time applications: online gaming (low ping means faster reaction registration), video conferencing (high latency causes awkward conversation delays), VoIP calls, financial trading, and remote desktop sessions. Guide: under 20ms is excellent; 20–50ms is good; 50–100ms is acceptable; over 150ms causes noticeable issues. Traditional geostationary satellite internet has latency of 500–700ms, making real-time applications unusable. Starlink’s low-earth orbit satellites achieve 20–60ms. Your latency is affected by your internet connection type, distance to server, network congestion, and router quality. See also: Starlink, Bandwidth, NBN.
LCD (Liquid Crystal Display)
LCDs use a backlight (originally fluorescent, now LED) shining through a liquid crystal panel to produce images. An electric current aligns liquid crystals to control how much light passes through each pixel, combined with a colour filter to produce colour. LCD technology is used in computer monitors, laptops, TVs, smartphones, and instruments. Common LCD panel types: IPS (In-Plane Switching) – excellent colour accuracy and wide viewing angles, ideal for creative work; VA (Vertical Alignment) – higher contrast ratios, good for dark scenes and movies; TN (Twisted Nematic) – fastest response times but inferior colour/viewing angles, used in competitive gaming monitors. LCD has largely been superseded by OLED in premium devices. See also: OLED, Monitor, GPU.
Legacy Technology / End of Life (EOL)
Legacy technology refers to older hardware, software, or systems that are outdated but still in use – often because replacing them is expensive, complex, or disruptive. End of Life (EOL) is the date a vendor stops providing security updates, bug fixes, and support for a product. Windows upgrade and legacy system migration: Windows 7 (EOL January 2020), Windows 10 (EOL October 2025), Windows Server 2012, and many older software products continue to be used in Australia despite no longer receiving security patches. EOL systems connected to the internet are vulnerable to exploits that will never be patched. Common legacy scenarios in Australian businesses: ancient point-of-sale software that only runs on Windows XP; specialised manufacturing equipment with embedded old operating systems; old accounting software that can’t be migrated. Mitigation: isolate legacy systems from the internet and main network (air-gap or VLAN); compensating controls (strict firewall rules, IPS); or plan for replacement. See also: Windows Versions, Patch Management, VLAN, Air Gap.
Li-Fi (Light Fidelity)
Li-Fi is a wireless communication technology that transmits data using visible light, ultraviolet, or infrared radiation from LEDs, rather than radio waves (as used in Wi-Fi). By rapidly modulating the intensity of LED light at speeds imperceptible to the human eye, Li-Fi can achieve data transmission rates many times faster than Wi-Fi in ideal conditions (demonstrations have achieved over 100 Gbps in lab settings). Advantages over Wi-Fi: immunity to radio frequency interference; security (light cannot pass through walls, so signals are confined to a room); massive bandwidth availability (visible light spectrum is 10,000x wider than radio spectrum); and no contribution to radio frequency congestion. Disadvantages: line-of-sight requirement; interference from ambient light; and inability to penetrate walls (a limitation for roaming). Li-Fi is currently deployed in hospitals (where RF interference is problematic) and aircraft. See also: Wi-Fi 6 / 6E / 7, Bandwidth.
Linux
Linux is a free, open-source operating system kernel first created by Linus Torvalds in 1991. Unlike Windows or macOS, Linux is not a single product – it is distributed as many different “distros” (distributions) maintained by communities and companies, such as Ubuntu, Debian, Fedora, CentOS, Arch Linux, and Raspberry Pi OS. Linux dominates in server infrastructure (over 90% of the world’s web servers run Linux), cloud computing (AWS, Azure, and Google Cloud are all Linux-based), Android smartphones (built on the Linux kernel), supercomputers, IoT devices, and network equipment. For desktop use, Linux offers strong performance, high security, no licensing costs, and a large library of free software. Popular desktop distros for beginners include Ubuntu and Linux Mint. See also: OS (Operating System), Open Source Software, Server.
Liquid Cooling / Water Cooling
Liquid cooling uses a liquid coolant (usually distilled water with additives) rather than air to remove heat from computer components. In an AIO (All-in-One) liquid cooler, a pump circulates liquid through a block attached to the CPU, into tubes, through a radiator with fans (typically 240mm or 360mm), and back. AIO coolers are popular in gaming and high-performance PCs for quieter operation and better cooling than air coolers. Custom water cooling loops are built by enthusiasts and can cool CPUs, GPUs, and even RAM and motherboard VRMs simultaneously, achieving extreme overclocking headroom. Immersion cooling – submerging entire servers in dielectric fluid – is used in some data centres for maximum cooling efficiency. Compared to air cooling, liquid cooling is quieter, can handle higher thermal loads, and looks impressive – but requires more maintenance and costs more. See also: Thermal Throttling, CPU, GPU, Overclocking.
Large Language Model (LLM)
A Large Language Model is a type of AI system trained on massive text datasets to understand and generate human language. LLMs are the foundation of modern AI chatbots and generative AI tools. They work by predicting the most likely next token (word fragment) given the context of the preceding text – but through billions of parameters learned from training data, this produces remarkably coherent and capable outputs. LLM size is measured in parameters: GPT-4 is estimated at over 1 trillion parameters; smaller models like LLaMA 3 8B have 8 billion. Models can be run in the cloud (via API) or locally on powerful hardware (using tools like Ollama on modern PCs). Key LLMs include GPT-4o (OpenAI), Claude 3.5/3.7 (Anthropic), Gemini 1.5/2.0 (Google), LLaMA 3 (Meta, open source), Mistral, and Deepseek. See also: Generative AI, AI Chatbot, Artificial Intelligence, AI Computing.
Load Balancer
A load balancer distributes incoming network traffic across multiple servers to ensure no single server becomes overwhelmed, improving both performance and availability. When millions of users visit a popular website simultaneously, a load balancer routes each request to the least-busy server in a pool. Load balancing algorithms include: Round Robin (distribute requests evenly in order); Least Connections (send to the server with fewest active sessions); IP Hash (route the same user to the same server for session consistency). Load balancers also perform health checks – removing unhealthy servers from the pool automatically. Hardware load balancers (F5) and software/cloud load balancers (AWS ALB, Nginx, HAProxy) are both widely used. See also: Server, Cloud Computing, CDN.
Loading / Buffering
Loading and buffering describe the waiting time as your device retrieves data from a server, storage drive, or the internet. Loading is a general term for when content – a web page, program, image, or document – is being fetched and prepared for display. Buffering specifically refers to the pre-loading of streaming media (video or audio); when a video buffers, it downloads enough ahead of the playback point to ensure smooth continuous playback. Slow loading/buffering is usually caused by a slow internet connection, an overloaded server, insufficient RAM, a slow hard drive, or an overheating computer. The spinning circle, progress bar, or hourglass cursor indicates the computer is loading or processing. See also: Streaming, Bandwidth, NBN, RAM.
Local AI / On-Premises AI (Ollama)
Local AI refers to running AI language models directly on your own computer rather than using cloud-based services. This addresses key concerns about cloud AI: privacy (your data never leaves your device); cost (no per-token API fees for heavy use); internet independence (works offline); and customisation (full control over the model and its behaviour). Ollama is the most popular tool for running local AI models – it simplifies downloading and running open-source models like LLaMA 3, Mistral, Phi-3, and Gemma on Mac, Windows, and Linux. Hardware requirements: 8GB RAM minimum for small models (7B parameters); RAM and hardware upgrade for AI computing; 64GB+ for larger models (70B+); a modern GPU dramatically speeds up inference. Use cases: private document analysis; local coding assistant (integrates with VS Code via Continue extension); offline chatbot; testing and development. The gap between cloud and local AI quality has narrowed dramatically; Llama 3 70B matches early GPT-4 quality on many tasks. See also: Large Language Model (LLM), AI Computing / AI PC, GPU, Edge AI.
Location Tracking on Mobile
Your smartphone is a precise location tracking device. Understanding how your location is shared and collected: GPS – satellite-based location; most accurate (3–5 metres); used by maps and navigation apps; battery-intensive; only active when an app requests location. Wi-Fi location – nearby Wi-Fi networks are compared to a database to estimate position; accurate to 15–40 metres; works indoors where GPS is weak. Cell tower triangulation – your carrier can determine your location (within hundreds of metres) from which towers your phone is connected to; this data is held by carriers and can be requested by law enforcement. Bluetooth beacons – retail stores use Bluetooth beacons to track shopper movement; requires Bluetooth to be on. Managing location privacy: iOS – Settings > Privacy & Security > Location Services; Android – Settings > Location; review each app’s permission (Only While Using vs Always vs Never); mobile privacy setup to only navigation apps that genuinely need it. See also: GPS, Digital Footprint, Geofencing.
Log In / Log Out / Password
Logging in (also called signing in) is the process of entering your username and password (and possibly a second factor) to access a computer, website, or application. A username identifies who you are; a password proves you are who you claim to be. Logging out (signing out) ends your session and secures your account. Failing to log out on a shared computer leaves your accounts accessible to the next person. Common log-in mistakes: Caps Lock being on (passwords are case-sensitive); incorrect username; forgotten password (use the “Forgot Password” link to reset via email). Never share your password with anyone – our professional IT support team should never need to ask for it. See also: User Account, Password Manager, Multi-Factor Authentication (MFA), Biometrics.
Logic Board / Motherboard Repair
The logic board (Apple’s term; equivalent to the motherboard in Windows PCs) is the main circuit board of a computer or phone containing the CPU, RAM (often soldered), GPU, and all core components. Logic board repair is the most complex and highest-skill area of computer repair. Types of logic board failure: Liquid damage – corrosion and short circuits from water or other liquids; Component failure – individual chips (power management ICs, USB controllers, charging controllers) failing; GPU failure – particularly prevalent in older MacBook Pro models (the infamous 2011–2013 dGPU issue); BGA failure – solder ball connections under chips failing due to thermal cycling (the chip can sometimes be reflowed). Chip-level repair: uses microscopes, hot-air rework stations, and soldering equipment to replace individual components on the logic board rather than replacing the entire board – significantly cheaper than board replacement when successful. The Original PC Doctor offers chip-level logic board repair at our advanced repair facility. See also: Motherboard, Water Damage Repair, Thermal Paste, CPU.
Logical Failure vs Physical Failure
Understanding the type of failure is the first step in data recovery: Logical failure means the storage hardware is physically intact but the data is inaccessible due to a software or data structure problem. Causes include: accidental deletion, accidental formatting, partition table corruption, file system corruption, MBR/GPT damage, software crashes during write operations, and ransomware encryption. Logical recovery is generally less expensive than physical recovery and can often be performed without our forensic and cleanroom data recovery using our data recovery service. Physical failure means the storage hardware itself has malfunctioned – mechanical failure in an HDD (head crash, seized spindle motor, damaged platters), electronic failure (burned PCB/controller), or NAND flash failure in an SSD. Physical recovery typically requires cleanroom facilities, donor parts, and specialist hardware. Many drives experience both logical and physical failure simultaneously. See also: Data Recovery, Cleanroom, Head Crash, PCB (Drive), File System.
Lossless vs Lossy Compression
When digital files are compressed to save storage space or reduce transmission size, two approaches exist: Lossless compression reduces file size without discarding any data – the original can be perfectly reconstructed. ZIP, PNG, FLAC, and RAW image formats use lossless compression. Essential for documents, text, databases, and any content where every bit matters. Lossy compression discards data deemed less perceptible to human senses, achieving much greater size reductions. JPEG (images), MP3 (audio), and H.264 (video) are all lossy. The more you compress, the lower the quality – very high compression (low bitrate) produces visible artefacts in images (blockiness) and audio (tinny sound). Modern AI-powered codecs are improving the quality/size trade-off significantly. See also: Codec, File Extension, Streaming.
Low-Code / No-Code Development
Low-code and no-code platforms allow people with little or no programming experience to build software applications using visual interfaces, drag-and-drop components, and pre-built templates – rather than writing traditional code. No-code platforms require zero programming knowledge: tools like Bubble, Webflow, Glide, and AppSheet allow non-technical “citizen developers” to build working web and mobile apps through visual configuration. Low-code platforms require minimal coding and are typically used by professional developers to build applications faster, with some customisation through code: Microsoft Power Apps, OutSystems, and Mendix are leading examples. These platforms are democratising software development – businesses can now build internal tools, automate workflows, and create customer-facing apps without expensive developer resources. See also: Programming Language, SaaS, API.
MAC Address (Media Access Control Address)
A MAC address is a unique hardware identifier assigned to every network interface card (NIC) or Wi-Fi adapter at the time of manufacture. It consists of six groups of two hexadecimal digits (e.g., 00:1A:2B:3C:4D:5E). Unlike IP addresses (which are assigned by the network and can change), MAC addresses are hardcoded into the hardware – though modern operating systems support MAC address randomisation for privacy purposes. MAC addresses are used for communication within a local network (your router uses MAC addresses to identify devices); MAC filtering can be used to restrict which devices can join a Wi-Fi network; and network administrators use MAC addresses to assign permanent IP addresses (DHCP reservations) to specific devices. See also: IP Addressing, Router, Ethernet.
Machine Learning (ML)
Machine learning is a branch of artificial intelligence where computer systems learn from data to improve their performance without being explicitly programmed for every scenario. Instead of writing rules manually, a machine learning model is “trained” on large labelled datasets, finding patterns that allow it to make predictions or decisions on new, unseen data. Types include: Supervised learning (training on labelled examples – e.g., teaching an algorithm to classify email as spam or not-spam); Unsupervised learning (finding patterns in unlabelled data – e.g., customer segmentation); and Reinforcement learning (learning through trial and error with rewards – used to train game-playing AI and robotics). Real-world applications include fraud detection, medical image analysis, recommendation engines, predictive maintenance, and weather forecasting. See also: Artificial Intelligence, Deep Learning, Neural Network, GPU.
macOS Versions (Sequoia / Sonoma / Ventura)
Apple releases a major macOS update annually, each named after a California landmark. Recent versions: macOS Sequoia (15, 2024) – iPhone Mirroring (control your iPhone from your Mac), improved Window tiling, Apple Intelligence AI features, enhanced Safari, and iPhone call routing. macOS Sonoma (14, 2023) – interactive widgets on desktop, screensaver enhancements, Game Mode, enhanced video calls with reactions, and web apps in the Dock. macOS Ventura (13, 2022) – Stage Manager (new window management), Continuity Camera (using iPhone as webcam), and Desktop & Dock redesign. Unlike Windows, macOS updates are free for supported Macs. Apple typically supports Macs with macOS updates for 7–8 years from release. Older Macs excluded from current macOS stop receiving security updates, becoming vulnerable – Apple Mac repairs and upgrades. See also: Apple Silicon, macOS Security, Time Machine.
macOS Security Features
macOS includes multiple layers of security built directly into the operating system: Gatekeeper – prevents running software that hasn’t been signed by a known developer or approved by Apple’s notarisation process; when you try to open an unrecognised app, macOS blocks it by default (you can override in System Settings > Privacy & Security). System Integrity Protection (SIP) – protects critical system directories from being modified, even by the root user or malware. XProtect – Apple’s built-in malware signature scanner that silently checks apps against known malware definitions. Transparency, Consent and Control (TCC) – requires explicit user permission before any app can access your camera, microphone, contacts, location, photos, or files. FileVault – full-disk encryption (covered separately). Secure Enclave – dedicated security chip in all Apple Silicon and T2 chip Macs handling encryption keys, Touch ID, and boot integrity. See also: FileVault, Gatekeeper, Apple Silicon.
macOS Terminal / zsh
The Terminal is macOS’s command-line interface – a text-based window for running powerful commands directly. macOS is built on a UNIX foundation, meaning the Terminal provides access to a full UNIX/Linux-like environment. Since macOS Catalina (2019), the default shell has been zsh (Z Shell), replacing bash. Terminal is used by: developers (running build tools, servers, version control); system administrators (managing files, permissions, processes); power users (automating repetitive tasks with scripts); and professional Mac support and repair (running network tools, penetration testing utilities). Useful Terminal commands for regular users: diskutil list (list all drives); top (live process monitor); ping (network connectivity test); defaults write (change hidden system settings); open . (open current directory in Finder). Terminal scripts (.sh files) can automate complex multi-step tasks. See also: CLI / Terminal, Linux, SSH.
Malvertising
Malvertising (malicious advertising) is a cyberattack technique that injects malicious code into legitimate online advertising networks. Ads containing malware can appear on reputable, well-known websites and may infect visitors’ computers simply by being displayed – without requiring the user to click anything (known as a “drive-by download”). Malvertising is difficult to avoid because it exploits legitimate ad networks. Protection includes professional computer maintenance, using an ad blocker (uBlock Origin is highly regarded), and ensuring operating systems and browsers are patched. See also: Malware, Cybersecurity, Browser.
Malware
Malware is an umbrella term for any software intentionally designed to disrupt, damage, or gain unauthorised access to a computer system. Types include: Virus (self-replicating, attaches to files); Worm (self-replicating, spreads across networks without user action); Trojan Horse (disguised as legitimate software); Ransomware (encrypts files and demands payment); Spyware (secretly monitors activity); Adware (displays unwanted advertising); Rootkit (hides itself deep in the OS); Keylogger (records keystrokes); and Botnet malware (enlists your computer in a network controlled by attackers). Malware is distributed via phishing emails, malicious downloads, compromised websites, USB drives, and software vulnerabilities. Defence requires antivirus software, professional virus removal, and user awareness. See also: Ransomware, Virus, Trojan Horse, Worm, Phishing, Cybersecurity.
Managed IT Services / MSP
Managed IT Services refers to outsourcing the ongoing management, monitoring, and maintenance of an organisation’s IT infrastructure to a specialist third-party provider called a Managed Service Provider (MSP). Rather than hiring full-time IT staff or waiting for things to break before calling for help (break-fix model), businesses pay a fixed monthly fee for proactive IT management. Services typically include: 24/7 network and systems monitoring, patch management, backup management, endpoint security, helpdesk support, vendor management, and strategic IT consulting. MSPs are particularly valuable for small and medium businesses (SMBs) that cannot afford an in-house IT team. our home and office computer repair and IT support services mobile computer repair and business IT support services across Australia. See also: Cybersecurity, Cloud Computing, Remote Desktop.
Managed Switch vs Unmanaged Switch
Network switches come in two main types: Unmanaged switches are plug-and-play devices with no configuration interface – you plug in network cables and they forward traffic automatically. Suitable for home use and small offices with simple network needs. Managed switches offer configuration interfaces (web UI, CLI, SNMP) enabling: VLAN configuration; Quality of Service (QoS) priority settings; Port mirroring (for network monitoring); Loop prevention (Spanning Tree Protocol); Port security; Link aggregation (combining multiple ports for higher bandwidth); and detailed traffic statistics. Managed switches are essential for any network requiring segmentation, security, or performance management. Smart/web-managed switches are a middle ground: more configurable than unmanaged but simpler than fully managed. Popular managed switch brands: Cisco, HP Aruba, Netgear, TP-Link, and Ubiquiti. See also: Network Switch, VLAN, QoS.
Matter / Thread (Smart Home Standards)
Matter is the new universal smart home interoperability standard, developed jointly by Apple, Google, Amazon, Samsung, and the Connectivity Standards Alliance (CSA). Before Matter, smart home devices were fragmented across incompatible ecosystems – a Google Home device might not work with Apple HomeKit, and vice versa. Matter devices work with all major platforms simultaneously: a single Matter light bulb can be controlled via Siri, Google Assistant, and Amazon Alexa at the same time. Thread is a low-power mesh networking protocol designed specifically for smart home IoT devices (not Wi-Fi or Bluetooth). Thread devices form a self-healing mesh where each device extends coverage; a Thread Border Router (built into smart home and network setup, Google Nest Hub) bridges Thread devices to the home IP network. Matter can run over Thread, Wi-Fi, or Ethernet. See also: Smart Home, IoT, Wi-Fi 6 / 6E / 7.
MBR / GPT (Partition Table Formats)
The partition table is a data structure on a storage device that records where partitions start and end. Two main formats exist: MBR (Master Boot Record) is the older format, located in the first 512 bytes of a drive. MBR supports a maximum of 4 primary partitions and drives up to 2TB. MBR stores the first-stage bootloader code and partition table in the same sector – corruption of the MBR causes the computer to fail to boot. GPT (GUID Partition Table) is the modern format used on all drives larger than 2TB, and required for drives used with UEFI firmware. GPT supports up to 128 partitions, drives up to 9.4 zettabytes, and stores multiple backup copies of the partition table across the drive, making it more resilient to corruption. Corruption of either MBR or GPT causes data inaccessibility but data is typically still present and recoverable. See also: Partition, Data Recovery, BIOS / UEFI, BCD.
MDM (Mobile Device Management)
Mobile Device Management is a security software solution that allows organisations to remotely manage, monitor, configure, and secure mobile devices (smartphones, tablets, and laptops) used by employees. MDM capabilities include: enrolling and configuring devices; enforcing security policies (PIN requirements, encryption, screen lock timeout); remotely wiping a device if lost or stolen; pushing software updates and applications; monitoring device health and compliance; and separating corporate data from personal data on BYOD (Bring Your Own Device) devices. Popular MDM platforms include Microsoft Intune, Jamf (for Apple devices), and VMware Workspace ONE. MDM is a key component of enterprise mobile security strategy. See also: Cybersecurity, Cloud Computing, Zero Trust Security.
BYOD (Bring Your Own Device) Policy
BYOD refers to the practice of employees using their personally owned smartphones, tablets, and laptops to access corporate systems, email, and data. BYOD creates security and privacy challenges: corporate data on personal devices that may not be secured; employees leaving and taking data with them; mixing personal and work communications on the same device. MDM for BYOD – enterprise MDM solutions (Jamf, Intune, VMware Workspace ONE) can manage BYOD devices by creating a work profile (Android) or supervised profile (iOS) – a sandboxed container for work apps and data on the personal device. The organisation manages the work container; the employee’s personal apps remain private and unmanaged. BYOD policy should specify: what data can be accessed; remote wipe rights (container-only, not whole device); acceptable use; and what happens when an employee leaves. See also: MDM, Zero Trust Security, Mobile Banking Security.
Mechanical Keyboard Switches
Mechanical keyboards use individual physical switches under each key rather than the rubber dome membrane found in most standard keyboards. The switch type determines the typing feel and sound. Switch types are typically described by: Actuation force (how hard you press); Tactile feedback (physical bump when key registers); Click (audible click). Main categories: Linear (smooth keystroke, no bump or click – Cherry MX Red, Speed Silver, Gateron Yellow): quietest and fastest; popular for gaming. Tactile (bump when key registers, no click – Cherry MX Brown, Gateron Brown, Boba U4): good feedback without disturbing others; popular for typing. Clicky (tactile bump plus audible click – Cherry MX Blue, Kailh Box White): loud, satisfying; preferred by many touch typists; not office-appropriate. Switch manufacturers: Cherry MX (German, the original standard), Gateron, Kailh, and many others. Mechanical keyboards typically last 50–100 million keystrokes vs 5–10 million for membrane keyboards. See also: Keyboard, Ergonomic Accessories.
Media Server / Plex / Home NAS
A media server is a computer or dedicated device that stores and streams your personal media library (movies, TV shows, music, photos) to other devices on your home network or remotely over the internet. Plex Media Server is the most popular media server software – it organises your media, fetches artwork and metadata, transcodes video to match the capabilities of the playback device, and provides apps for virtually every platform (Smart TV, Apple TV, Chromecast, iOS, Android, web). NAS and media server setup for transcoding (a NAS with Intel Quick Sync, a desktop PC, or a dedicated server). Jellyfin is a free, open-source alternative to Plex with no subscription required. Home NAS as media server: Synology and QNAP NAS devices include Plex server support and have sufficient processing power for 1–2 simultaneous streams. Plex Pass (subscription) adds offline sync, hardware transcoding, and live TV DVR functionality. See also: NAS, Streaming, Codec, Smart TV, Streaming Stick.
Medicare Online Services
Medicare is Australia’s universal health insurance scheme. Digital Medicare services available through myGov and the Medicare Express Plus app: Claiming Medicare rebates – for out-of-pocket medical expenses not bulk-billed; submit claims online within two years of service. View Medicare history – full history of services claimed and providers consulted. Manage concession cards – Health Care Card, Pensioner Concession Card details and replacement. Organ and tissue donation register – update donation preferences. Pharmaceutical Benefits Scheme (PBS) – view prescription history and safety net status. Medicare card renewal – digital Medicare card in the Medicare app can be used at most medical services instead of a physical card. Bulk billing – when a GP bulk bills, they claim the Medicare rebate directly and you pay nothing; non-bulk-billed services require a gap payment. Scam warning: Medicare will never call asking you to confirm bank details or pay a fee to receive a payment; report suspicious contacts to Scamwatch. See also: myGov, My Health Record, Centrelink Digital.
Mesh Network / Wi-Fi Mesh
A mesh network uses multiple wireless access point nodes placed throughout a home or building, all working together as a single seamless Wi-Fi network. Unlike a traditional setup with one router (possibly supplemented by a weaker Wi-Fi extender), a mesh system automatically routes each device through the node providing the best signal. Nodes communicate with each other via a dedicated backhaul connection (either a separate Wi-Fi band or Ethernet cables). Popular mesh systems include Google Nest, Amazon Eero, TP-Link Deco, Netgear Orbi, and Ubiquiti UniFi (the latter popular for business use). Mesh networks eliminate dead spots in large homes, multi-storey buildings, or spaces with thick concrete walls. troubleshoot your home Wi-Fi, use Ethernet backhaul between nodes where possible. See also: Wi-Fi 6 / 6E / 7, Router, Network.
Metadata
Metadata is data that describes other data – essentially information about information. Examples: the metadata of a photo includes the date taken, GPS location, camera model, and settings (aperture, shutter speed, ISO), even though none of this appears in the photo itself; a Word document’s metadata includes the author name, creation date, and edit history; an email’s metadata includes sender, recipient, timestamps, and server routing information (but not necessarily the content). Metadata is extensively used by government intelligence agencies and law enforcement for surveillance – a phone’s call metadata (who called whom, when, for how long) can reveal detailed patterns of life even without recording conversations. Before sharing documents or photos online, you may want to strip metadata using tools like ExifTool, GIMP (for images), or File > Properties in Word. See also: Privacy, Cookie, Data Breach.
Metaverse
The metaverse describes a vision of persistent, interconnected, immersive virtual worlds where people socialise, work, play, and transact through digital avatars. The concept was popularised by Meta (Facebook’s parent company), which rebranded and invested tens of billions of dollars in VR hardware (Meta Quest headsets) and virtual social platforms (Horizon Worlds). While a fully realised metaverse remains more aspiration than reality, elements exist in: gaming platforms (Roblox, Fortnite’s live events, Minecraft); social VR apps (VRChat, AltspaceVR); virtual concerts and brand activations; and blockchain-based virtual worlds (Decentraland, The Sandbox). The Apple Vision Pro headset (2024) represents a premium spatial computing approach, focused on productivity and media consumption rather than social worlds. See also: Augmented Reality (AR) and Virtual Reality (VR), Blockchain, NFT.
Multi-Factor Authentication (MFA) / Two-Factor Authentication (2FA)
Multi-Factor Authentication adds extra verification layers beyond just a password when logging into accounts. The three authentication factors are: Something you know (password, PIN); Something you have (a phone app generating a time-based code, a hardware security key like YubiKey); Something you are (fingerprint, face recognition). Requiring at least two of these factors dramatically reduces the risk of account compromise – even if a password is stolen, an attacker still cannot log in without the second factor. MFA is strongly recommended for: email accounts, banking, social media, cloud storage, business software, and domain registrars. Authenticator apps (Google Authenticator, Microsoft Authenticator, Authy) are significantly more secure than SMS codes, which can be intercepted via SIM-swap attacks. See also: Cybersecurity, Biometrics, Password Manager, Windows Hello.
Microphone (Computer Microphone)
A computer microphone captures voice audio for video calls, podcasting, streaming, voice recognition, dictation, and recording. Types: Built-in microphone – integrated into laptops, webcams, and monitors; convenient but often mediocre quality with significant background noise pickup; USB microphone – a standalone condenser or dynamic microphone connecting via USB; excellent quality with no additional hardware required; popular for podcasting and streaming (Blue Yeti, Audio-Technica AT2020 USB); Headset microphone – built into a headset; good for calls and gaming; XLR microphone – professional-grade, requires an audio interface connecting to USB; studio quality. A pop filter (foam or mesh screen) reduces “plosive” sounds (p, b sounds). See also: Headphones / Headset, USB, VoIP.
Microservices Architecture
Microservices is an architectural approach to building software applications as a collection of small, independently deployable services that each handle a specific business function and communicate with each other via APIs. Contrast with a monolithic architecture where all functionality is in one large codebase. In a microservices design, an e-commerce platform might have separate services for: user authentication, product catalogue, shopping cart, payment processing, order management, and notifications. Each can be developed, scaled, and deployed independently. Benefits: independent scaling (scale only the bottleneck service); technology flexibility (each service can use different languages/databases); faster deployment; and fault isolation. Challenges: increased operational complexity, distributed system debugging, and network latency between services. See also: Cloud Computing, Containerisation / Docker, API.
Microsoft 365 Explained
Microsoft 365 (formerly Office 365) is Microsoft’s cloud-based subscription service that bundles productivity software, cloud services, and security tools. Consumer plans: Microsoft 365 Personal ($109/year, 1 user, 1TB OneDrive, full Office apps on 5 devices); Microsoft 365 Family ($149/year, up to 6 users). Business plans: Business Basic ($7.50/user/month – cloud apps only, no desktop Office); Business Standard ($18.75/user/month – desktop apps + Teams + SharePoint); Business Premium (adds advanced security tools). Core applications: Word (word processing); Excel (spreadsheets); PowerPoint (presentations); Outlook (email and calendar); Teams (video calls, chat, collaboration); OneDrive (cloud storage and file sync); SharePoint (team intranets and document libraries); OneNote (digital notebook). All apps work on Windows, macOS, iOS, and Android. Microsoft Copilot AI features are embedded throughout. Microsoft 365 dominates Australian business – most organisations, schools, and government agencies use it. See also: Cloud Computing, SaaS, OneDrive, Teams Collaboration, Microsoft Copilot.
Mini-LED / Micro-LED
Two display backlighting technologies that improve on traditional LED LCD panels: Mini-LED – uses thousands of tiny LED backlighting zones (thousands vs hundreds in standard LED LCD), allowing much finer local dimming control. This dramatically improves contrast – dark areas can be dimmed independently while bright areas remain bright, closing the gap with OLED. Apple’s ProDisplay XDR and iPad Pro, Samsung’s Neo QLED, and many high-end gaming monitors use Mini-LED. Still an LCD panel – suffers from some blooming (halo effect around bright objects on dark backgrounds). Micro-LED – the next generation; each pixel IS an LED (like OLED but using inorganic LEDs); no backlight at all; achieves OLED-like contrast and HDR; far higher brightness; no burn-in risk; longer lifespan. Currently extremely expensive (Samsung The Wall) but expected to become mainstream within a decade. See also: OLED, LCD, HDR, Monitor.
Man-in-the-Middle Attack (MITM)
A Man-in-the-Middle attack occurs when a cybercriminal secretly intercepts and potentially alters communication between two parties who believe they are communicating directly with each other. The attacker positions themselves “in the middle” of a conversation – for example, intercepting data between your laptop and a public Wi-Fi router, or between your browser and a banking website by forging security certificates. MITM attacks can be used to capture login credentials, session tokens, and financial data, or to inject malicious content into web pages. Protection: use HTTPS (the padlock in your browser), professional network security setup, keep devices updated, and enable HSTS in your browser. See also: Cybersecurity, Encryption, VPN, HTTPS.
Mobile Banking Security
Mobile banking apps handle some of your most sensitive financial data and require the highest security practices. Protecting your mobile banking: Only download banking apps from official sources – App Store (iOS) or Google Play (Android); verify the developer is your actual bank; fake banking apps are a known fraud vector; Enable biometric login – use Face ID or fingerprint rather than a 4-digit PIN for banking app access; Never bank on public Wi-Fi without a VPN; Enable transaction notifications – instant alerts for any transaction allow immediate fraud detection; Never share your banking app PIN or password with anyone – bank staff will never ask for these; Check the app regularly for unauthorised transactions; Lock or remotely wipe a lost phone immediately before contacting your bank; and If you receive a call claiming to be from your bank asking you to verify a payment or transfer money, protect yourself from banking scams directly using the number on the back of your card or their official website. See also: Phishing, SIM Swapping, Digital Wallet, Multi-Factor Authentication (MFA).
Mobile Data / 4G LTE
Mobile data refers to internet connectivity provided through a cellular network (3G, 4G LTE, or 5G) via a SIM card, rather than through Wi-Fi. 4G LTE (Long-Term Evolution) is the generation of mobile technology that became the Australian standard from around 2012, offering typical speeds of 20–100 Mbps – fast enough for video streaming, video calls, and most everyday internet use. 4G coverage in Australia is extensive: Telstra’s 4G network covers 99.4% of the population (though not all land area). Data is measured in megabytes and gigabytes; when you exceed your mobile plan’s data allowance, carriers either charge for excess data or reduce your speed (throttle) to very slow speeds. See also: 5G, Hotspot, Bandwidth.
Mobile Malware Types
Mobile malware has evolved into a sophisticated threat. Common mobile malware categories: professional mobile malware removal – overlay legitimate banking apps with fake login screens to steal credentials; intercept SMS 2FA codes; examples include BankBot, Cerberus, Anubis (primarily Android); RATs (Remote Access Trojans) – give attackers full remote control of the device; can activate camera, microphone, access all data; Adware / Fleeceware – apps that bombard users with ads or charge excessive subscription fees after a free trial; Cryptocurrency miners – silently use the device’s processor to mine cryptocurrency (causing battery drain and overheating); Spyware / Stalkerware (see separate entry); Ransomware – increasingly targeting mobile devices to encrypt files or lock the screen and demand payment; SMS premium diallers – silently subscribe to premium SMS services. iOS’s closed ecosystem means mobile malware is overwhelmingly an Android problem, though iOS is not immune (particularly via zero-day exploits). See also: Malware, Android Security, Google Play Protect, Stalkerware.
Mobile VPN Usage
Using a VPN on your smartphone is particularly important in scenarios where security risks are elevated. Key use cases for mobile VPN: Public Wi-Fi – café, airport, hotel networks are the highest risk; a VPN encrypts all traffic preventing eavesdropping; Mobile network privacy – your carrier can see all unencrypted traffic; a VPN prevents this; Bypassing geo-restrictions – accessing Australian streaming content while abroad, or accessing content restricted in certain countries; Preventing ISP throttling – some carriers throttle streaming traffic; a VPN can prevent detection. On iOS and Android, VPN apps create a system-wide tunnel (not just browser traffic). Reputable mobile VPN apps include NordVPN, ExpressVPN, ProtonVPN (has a free tier), and Mullvad. When selecting a VPN: look for a strict no-logs policy (ideally independently audited), jurisdiction outside Five Eyes intelligence alliance, kill switch support, and strong encryption (WireGuard or OpenVPN). See also: VPN, Encryption, Phone Security Checklist.
Model Size / Parameters
The size of a machine learning model is measured in parameters – the numerical weights (connection strengths) between neurons in the neural network. Parameters are what the model learns during training. A model with more parameters can generally capture more complex patterns and knowledge, but requires more memory, compute, and energy to run. Common sizes: early GPT-2 had 1.5 billion parameters; GPT-4 is estimated at over 1 trillion; smaller open-source models like LLaMA 3 8B have 8 billion. Model quantisation compresses models by representing parameters with fewer bits (e.g., 4-bit instead of 32-bit), enabling large models to run on consumer hardware with some quality trade-off. The number of parameters does not linearly correlate with usefulness – training data quality, architecture choices, and instruction tuning matter significantly. See also: Large Language Model (LLM), GPU, AI Computing.
Modem
A modem (modulator-demodulator) is a device that converts digital data from your computer network into the type of signal used by your internet connection infrastructure, and vice versa. In the NBN era, the NBN Connection Device (NCD) supplied by NBN Co handles the physical connection to the NBN network (fibre, HFC, or wireless). Your ISP-supplied or separately purchased modem/router (usually combined in one unit) then connects to the NCD and manages your local Wi-Fi network and device connections. See also: Router, NBN, ISP.
Monitor
A monitor (or display) is the screen that shows everything happening on your computer. Key specifications when choosing a monitor: Resolution – how many pixels make up the image (1080p, 1440p, 4K); Panel type – IPS for colour accuracy, VA for contrast, TN for speed; Refresh rate – how many times per second the image is redrawn (60Hz, 144Hz, 240Hz); Response time – how quickly pixels change colour, affecting motion blur (1ms–4ms for gaming); Size and aspect ratio – 24″–27″ is the sweet spot for most users; ultrawide 21:9 monitors offer expanded workspace; Connectivity – HDMI 2.1, DisplayPort 1.4, USB-C/Thunderbolt; HDR (High Dynamic Range) – wider colour range for supported content; Ergonomics – height, tilt, swivel, and pivot adjustment. See also: 4K / 8K Resolution, OLED, Refresh Rate, HDMI.
Monitor Arm / Monitor Stand
A monitor arm is an adjustable mounting bracket that clamps or bolts to a desk and holds a monitor, allowing full adjustment of height, depth, angle, and rotation. Benefits over a basic fixed monitor stand: full ergonomic positioning (screen at exact eye level); frees up desk space below the screen; enables quick switching between landscape and portrait orientation; and allows easy repositioning for collaboration. VESA mount compatibility (75×75mm or 100×100mm mounting pattern on the back of the monitor) is required for most arms. Single, dual, and triple monitor arms are available for multi-monitor setups. Popular brands include Ergotron, VIVO, Fellowes, and Brateck. See also: Monitor, Ergonomic Accessories.
Moore’s Law
Moore’s Law is the observation made by Intel co-founder Gordon Moore in 1965 that the number of transistors on a microchip doubles approximately every two years, while the cost roughly halves. For decades, this empirical prediction held remarkably true, driving exponential improvements in computing power, storage density, and efficiency. Moore’s Law is the underlying reason computers have become dramatically more powerful at lower cost over time. However, around 2015–2020, the pace began to slow as transistors approached atomic scale (modern CPUs use 3–5 nanometre processes). Rather than simply shrinking transistors, progress now comes from: architectural innovations (multi-core, 3D chip stacking, chiplets); specialised processors (GPUs, NPUs, TPUs); new materials; and new computing paradigms (quantum, photonic). See also: CPU, GPU, Quantum Computing, AI Computing.
Motherboard
The motherboard (also called the mainboard or system board) is the central printed circuit board that physically connects and allows communication between all components of a computer – the CPU, RAM, GPU, storage drives, power supply, and expansion cards. It houses the chipset, UEFI/BIOS firmware chip, PCIe expansion slots, M.2 SSD slots, SATA ports, RAM slots, CPU socket, and a range of rear I/O ports (USB, audio, Ethernet, video outputs). Form factors include ATX (full-sized), Micro-ATX (smaller), Mini-ITX (very compact), and E-ATX (extra large for workstations). Choosing the right motherboard requires matching the CPU socket type and chipset, desired RAM speed, number of storage connections, and expansion slots needed. See also: CPU, RAM, GPU, PCIe, BIOS / UEFI.
Mouse
A mouse is the standard pointing device used to control the cursor on screen. Moving the mouse across a surface moves the cursor; pressing buttons performs actions. Key components: Left button – primary click, select; Right button – context menu; Scroll wheel – scrolling, middle-click; Additional buttons – many mice include extra side buttons for Back/Forward navigation or custom functions. Mouse types: Optical mouse (uses LED light sensor, works on most surfaces); Laser mouse (more precise, works on more surfaces including glass); Trackball (stationary body with a ball you rotate – useful with limited desk space); Vertical mouse (ergonomic handshake position). Mice connect via USB cable, USB wireless dongle (2.4GHz), or Bluetooth. DPI (dots per inch) measures cursor sensitivity – adjustable in mouse settings. See also: Ergonomic Accessories, USB, Bluetooth, Cursor.
Mouse DPI / Sensor Types
DPI (dots per inch) for mice measures how sensitive the mouse is to movement – how many pixels the cursor moves on screen for every inch the mouse moves physically. Higher DPI = more cursor movement per physical movement. Common ranges: 400–800 DPI is standard for general use; 800–1600 DPI for everyday computing; 400–1600 DPI for gaming (lower DPI is often preferred for precision in first-person shooters as it allows more physical movement for precise aiming). Most gaming mice allow DPI to be adjusted on-the-fly. Sensor types: Optical sensors use LED light and work on most surfaces; laser sensors work on more surfaces (including glass) but can be less consistent; modern high-end optical sensors are generally superior to laser for gaming. Polling rate – how often the mouse reports its position to the computer (125Hz = every 8ms; 1000Hz = every 1ms; 4000Hz and 8000Hz available in high-end gaming mice). Higher polling rate means more responsive tracking. Ergonomics: choosing a mouse sized and shaped appropriately for your hand and grip style significantly affects comfort during long computing sessions. See also: Mouse, Ergonomic Accessories, Gaming.
Multi-Core Processor
A multi-core processor contains two or more independent processing units (“cores”) on a single chip. Each core can execute instructions independently, allowing true parallel processing. Common core counts: dual-core (2), quad-core (4), hexa-core (6), octa-core (8), and now consumer CPUs with up to 24 cores (e.g., Intel Core i9-14900K with 24 cores). More cores benefit tasks that can be divided across cores: video rendering, 3D animation, running virtual machines, scientific computation, music production, and game streaming. However, many everyday applications are not well-optimised for many cores and benefit more from higher single-core clock speeds. Modern CPUs often combine high-performance “P-cores” with efficient “E-cores” (Intel’s Hybrid Architecture) to balance performance and battery life. See also: CPU, Motherboard, GPU.
Multimodal AI
A multimodal AI model can process and generate multiple types of data – not just text but also images, audio, video, documents, and code – within a single unified model. GPT-4V, Claude 3 Sonnet, and Gemini Ultra are multimodal: you can upload a photo and ask a question about it, or describe an image and ask the AI to write a caption. Practical applications: describing images for visually impaired users; analysing medical scans alongside patient notes; processing receipts and invoices automatically; understanding diagrams in engineering documents; and generating images from text descriptions. Multimodal AI represents a significant step toward more general-purpose AI assistants that can interact with the full richness of human communication. See also: Generative AI, Large Language Model (LLM), AI Chatbot.
My Health Record (Australia)
My Health Record is Australia’s national digital health record system, managed by the Australian Digital Health Agency. It is a secure, online summary of an individual’s health information – medications, allergies, immunisation history, diagnostic imaging, pathology results, hospital discharge summaries, and healthcare provider notes – accessible by the patient and authorised healthcare providers anywhere in Australia. All Australians have been automatically registered (with opt-out options). Benefits: reduces repeated testing (a doctor can see your existing results); improves safety (medication interactions and allergies are visible); improves continuity of care between different providers; and is particularly valuable during emergencies when you cannot communicate. Patients control who can access their record. The system operates under strict privacy protections under the My Health Records Act 2012. See also: Privacy Act, Telehealth, myGov.
My Aged Care
My Aged Care (myagedcare.gov.au) is Australia’s central gateway for accessing government-funded aged care services. It allows older Australians and their families to: find information about available aged care services; apply for an assessment (ACAT – Aged Care Assessment Team for residential care; RAS – Regional Assessment Service for home care); manage My Aged Care portal access; check eligibility for the Commonwealth Home Support Programme (CHSP) or Home Care Packages (HCP). Digital access: create a myGov account linked to My Aged Care for online management; alternatively, call 1800 200 422. Technology for older Australians: The My Aged Care portal is designed to be accessible; larger text options; telephone support available for those not comfortable online. The Be Connected programme (beconnected.esafety.gov.au) provides free digital literacy training specifically for older Australians, including help with myGov, video calls, and staying safe online. See also: myGov, Digital Literacy, Accessibility Features.
myGov / ATO Online Services
myGov (my.gov.au) is Australia’s centralised online portal that provides access to a range of government services through a single login, including: ATO myTax (lodging tax returns); Medicare (claiming rebates, viewing history); Centrelink (managing payments); My Health Record; Child Support; and several other federal services. A myGov account uses two-factor authentication. The ATO (Australian Tax Office) never initiates contact via SMS or email with hyperlinks requesting personal information – protect yourself from government impersonation scams. Report ATO impersonation scams to ato.gov.au/scam. The ATO’s online services allow Australians to lodge tax returns, check tax debts, update bank details, access super information, and more. See also: Phishing, Multi-Factor Authentication, Digital ID.
NAS (Network Attached Storage)
A Network Attached Storage device is a dedicated file storage server connected to your home or office network, accessible by all computers, phones, and tablets on the network. Think of it as your own private cloud. NAS devices are used for: centralised file storage and sharing; media servers (streaming your own videos, music, and photos to TVs and devices); automated backup from multiple computers; hosting surveillance camera footage; and running applications. Popular NAS brands include Synology, QNAP, and Western Digital My Cloud. A NAS configured with RAID provides drive redundancy – if one hard drive fails, data is not lost. Unlike cloud storage, a NAS keeps your data on your own hardware under your control. See also: RAID, Cloud Backup, Network, Plex.
NAS Recovery (Network Attached Storage Recovery)
NAS recovery refers to the data recovery process for Network Attached Storage devices. NAS devices present unique recovery challenges: most use Linux-based operating systems and proprietary file systems (ext4, Btrfs, XFS, ZFS); many use RAID configurations internally; and the user interface often provides little visibility into the underlying storage health until a failure occurs. Common NAS failure scenarios: multiple simultaneous drive failures (exceeding RAID tolerance); RAID controller failure or configuration loss; accidental volume deletion; NAS firmware corruption; and individual drive failure in a RAID array. Recovery of data from a failed RAID NAS requires: specialist RAID reconstruction tools that understand the specific RAID level, stripe size, and disk order; imaging each member drive individually before attempting reconstruction; and our NAS data recovery service. See also: NAS, RAID, Data Recovery, RAID Recovery.
NAT (Network Address Translation)
NAT is a method used by routers to allow multiple devices on a private local network (each with their own private IP address like 192.168.x.x) to share a single public IP address assigned by the ISP. When a device inside your network makes a request to the internet, the router substitutes its private IP address with the router’s public IP, keeps a translation table, and when the response comes back, routes it to the correct device. NAT effectively acts as a basic firewall by hiding your internal network structure from the internet. CGNAT (Carrier-Grade NAT) is used by ISPs to conserve public IPv4 addresses further – multiple customers share one public IP – which can cause issues for services that need a stable public IP (VPN servers, game hosting, CCTV remote access). See also: Router, IP Addressing, Firewall, IPv6.
National Broadband Network (NBN)
The National Broadband Network is Australia’s national wholesale broadband infrastructure, built and operated by NBN Co (a government-owned corporation). The NBN connects Australian homes and businesses using a multi-technology mix: FTTP (Fibre to the Premises) – the fastest option, with fibre running directly to your home, supporting speeds up to 1 Gbps and earmarked for upgrade to 10 Gbps in future; FTTN (Fibre to the Node) – fibre to a nearby cabinet, then copper wire to the premises, limiting maximum speeds; FTTC (Fibre to the Curb) – fibre to a pit on the street, then copper for a short distance; HFC (Hybrid Fibre Coaxial) – using former Telstra/Foxtel cable TV infrastructure; Fixed Wireless – tower-based 4G radio signals for regional areas; Sky Muster satellite – for remote areas beyond fixed line reach. NBN Co is actively upgrading FTTN connections to FTTP, and many premises can now order an upgrade. Need professional NBN installation or setup help? The Original PC Doctor provides expert NBN and broadband installation across all Australian states. Experiencing NBN issues? See our NBN troubleshooting guide and our guide to fixing Wi-Fi issues at home. See also: Broadband, Starlink, ISP, Fibre Optic Cable.
NBN Speed Tiers Explained
Australian NBN plans are sold on speed tiers that specify the maximum download and upload speeds. The main residential tiers available via most ISPs are: NBN 25 – 25 Mbps download / 5 Mbps upload: suitable for light users (one person, basic streaming). NBN 50 – 50 Mbps / 20 Mbps: the most popular tier, suitable for 2–4 users with HD streaming. NBN 100 – 100 Mbps / 20 Mbps: recommended for households with 4+ users, multiple 4K streams, or working from home. NBN 250 – 250 Mbps / 25 Mbps: available on FTTP, HFC, and FTTC. NBN 1000 (Gigabit) – ~900 Mbps / 50 Mbps: available on FTTP only. Note: “typical evening speeds” are often lower than the maximum – professional NBN setup and speed optimisation, as this reflects real-world performance during peak hours (7–11pm). See also: NBN, Bandwidth, Latency.
NDIS & Assistive Technology
The National Disability Insurance Scheme (NDIS) funds a wide range of assistive technology for eligible participants with disability. Technology categories funded by the NDIS: Low-cost assistive technology (under $1,500 per item) – can be purchased without prior approval; includes apps, tablet stands, communication apps, screen readers. High-cost assistive technology – requires assessment and approval; includes communication devices (AAC – Augmentative and Alternative Communication devices), powered wheelchairs, hearing technology. Everyday technology – standard consumer devices (iPads, laptops) may be funded when they have a disability-specific purpose not already met by devices non-disabled people use. NDIS technology funding requires linking the technology directly to the participant’s disability-related needs. An NDIS plan includes supports under categories including Assistive Technology, and may include set-up and training. The NDIS website (ndis.gov.au) provides a technology guide. See also: Accessibility Features, Screen Reader, Wearable Technology.
Network
A network is two or more digital devices connected to allow sharing of files, internet access, printers, and other resources. Network types: LAN (Local Area Network) – devices in a home or office; WAN (Wide Area Network) – networks covering large geographic areas (the internet itself is the world’s largest WAN); WLAN (Wireless LAN) – a Wi-Fi based local network; MAN (Metropolitan Area Network) – a network spanning a city or campus; PAN (Personal Area Network) – short-range networks between personal devices (Bluetooth). Network topologies (how devices are physically or logically connected) include star, mesh, ring, and bus. See also: Router, Network Switch, Ethernet, Wi-Fi, VPN.
Network Congestion / Internet Throttling
Network congestion occurs when the volume of data being transmitted across a network segment exceeds its available capacity, causing packet loss, increased latency, and reduced speeds – similar to a traffic jam on a road. Congestion can occur at multiple points: within your home network (too many devices competing for Wi-Fi bandwidth); at your router or modem; within your ISP’s network; or at internet exchange points. ISP throttling is the deliberate slowing of specific types of internet traffic by ISPs: some ISPs throttle video streaming, torrenting, or gaming traffic during peak hours, or after you’ve exceeded a data quota. The typical evening speed figure on NBN plans reflects real-world performance during congested peak hours. Use a speed test (fast.com or guide to fixing slow internet at home) to diagnose and compare expected vs actual speeds. See also: Bandwidth, Latency, NBN, QoS.
Network Monitoring / SNMP
Network monitoring is the continuous observation of a computer network’s health, performance, and availability – alerting administrators when problems arise. Monitored metrics include: bandwidth utilisation (is a link approaching capacity?); device availability (is this router/switch still up?); latency and packet loss; error rates; temperature and hardware health; and security events. SNMP (Simple Network Management Protocol) is the standard protocol used by network devices (routers, switches, printers, UPS units) to report their status to monitoring platforms. Popular monitoring tools: PRTG Network Monitor, Zabbix, Nagios, LibreNMS, and SolarWinds. Cloud-based monitoring: Datadog, New Relic, and AWS CloudWatch. For businesses, proactive network monitoring and managed IT – a failing hard drive can be replaced during business hours rather than causing a crisis at 2am. See also: Server, Network, Managed IT Services.
Network Switch
A network switch is a device that connects multiple wired devices on the same local network, directing traffic only to the specific port (and device) it is intended for – unlike older “hubs” which broadcast traffic to every connected device. Switches are used to expand the number of wired connections available beyond the router’s built-in ports. An unmanaged switch simply connects devices without configuration. A managed switch offers additional control: VLANs (virtual network segments), Quality of Service (QoS) prioritisation, traffic monitoring, and port security. Common switch port speeds are 1 Gbps (gigabit) and 2.5 Gbps; high-end switches support 10 Gbps for connecting servers and NAS devices. See also: Router, Ethernet, Network, Power over Ethernet (PoE).
Network Topology
Network topology describes the physical or logical arrangement of devices in a network. Common topologies: Star – all devices connect to a central switch or router (the professional network installation and setup; easy to add/remove devices; failure of one device doesn’t affect others; but central hub is a single point of failure); Mesh – each device connects to multiple others, providing redundant paths (used in enterprise networks and Wi-Fi mesh systems for resilience); Ring – each device connects to exactly two others forming a ring (used in older token ring networks and fibre rings); Bus – all devices share a single communication line (very old coaxial Ethernet; now obsolete); Tree/Hierarchical – devices arranged in parent-child hierarchy (typical in larger organisations). See also: Network, Ethernet, Mesh Network.
Neural Network
A neural network is a computational model loosely inspired by the human brain, consisting of layers of interconnected nodes (“neurons”) that process and transform data. Inputs are fed into an input layer, pass through one or more hidden layers where patterns are extracted, and produce output from an output layer. The connections (called weights) between neurons are adjusted during training to minimise errors. Deep neural networks with many hidden layers are the engine of modern deep learning and AI. Types include: CNN (Convolutional Neural Network) – for image recognition; RNN (Recurrent Neural Network) – for sequential data like time series and speech; Transformer – the architecture behind all modern LLMs (GPT, Claude, Gemini). See also: Deep Learning, Artificial Intelligence, Machine Learning.
NFC (Near Field Communication)
NFC is a short-range wireless technology enabling data exchange between devices held within a few centimetres of each other. NFC is the technology behind: tap-and-go contactless payments (Apple Pay, Google Pay, bank cards); pairing Bluetooth devices with a tap; reading NFC tags embedded in posters, packaging, or business cards; scanning digital travel passes; and NFC-enabled access control systems. NFC operates at 13.56 MHz and is built into virtually all modern smartphones and credit cards. Unlike Bluetooth (which requires pairing) or Wi-Fi (which requires network configuration), NFC is instant and requires no setup. See also: Bluetooth, IoT, Smart Home.
NFT (Non-Fungible Token)
An NFT is a unique digital certificate of ownership recorded on a blockchain. Unlike cryptocurrency (where one Bitcoin is interchangeable with another), each NFT is one-of-a-kind and represents ownership of a specific digital item. NFTs have been used to sell digital art, music, video clips, virtual real estate, and in-game items. The NFT market experienced a dramatic speculative boom in 2021 (with some digital images selling for millions of dollars) followed by a major market collapse. The underlying technology has legitimate long-term applications in provenance verification, digital collectibles, event ticketing (preventing scalping), and creator royalties. See also: Blockchain, Cryptocurrency, Metaverse.
Notification
A notification is an alert or message that a program, app, or operating system displays to tell you something requires attention – a new email, a chat message, a software update available, a reminder, a security alert, a low battery warning, or a completed download. In Windows 11, notifications appear as pop-ups in the bottom-right corner and are collected in the Notification Centre (click the date/time in the taskbar). On smartphones, notifications appear in the lock screen and notification shade. Too many notifications can be distracting; you can control which apps are allowed to send notifications in Settings > Notifications. See also: Windows Updates, Taskbar.
Notion / Knowledge Management Apps
Notion is an all-in-one workspace application combining a wiki, database, project management, and note-taking in a single highly flexible platform. It represents a new category of “connected workspace” tools. Core concepts: Pages (documents that can contain any combination of text, databases, images, embeds, and sub-pages); Databases (tables, boards, calendars, galleries, timelines and lists – all views of the same underlying data); Blocks (every element is a draggable block). Notion is used for: personal note-taking; company wikis and documentation; project management; CRM; content calendars; engineering specs. Notion AI can draft, summarise, translate, and extract action items from any page. Competitors: Obsidian (local-first, Markdown-based, strong for personal knowledge); Confluence (Atlassian, enterprise wiki); Coda; Roam Research. Notion has a generous free tier for individuals; team pricing from $10 USD/user/month. See also: Knowledge Management, Project Management Software, SaaS.
NTP (Network Time Protocol)
NTP is the protocol that automatically synchronises the clocks of computers and network devices over the internet to highly accurate time servers. Accurate timekeeping is critical in computing for: security certificate validation (certificates have validity periods); log correlation (matching events across systems requires precise timestamps – even a few seconds difference can make incident investigation impossible); file system operations; authentication protocols; and financial transactions. Windows and macOS automatically synchronise with internet time servers. NTP operates over UDP port 123. Your computer’s time server can be checked in Windows (Settings > Time & Language > Date & time > Sync now) or Mac (System Settings > General > Date & Time). Servers cascade from Stratum 0 (atomic clocks, GPS) to Stratum 1 (directly connected to stratum 0) down to your computer. If your computer’s clock is consistently wrong, it can cause HTTPS certificate errors and failed logins. See also: Protocol, HTTPS / SSL / TLS, Network.
Number Portability / Phone Number Porting
Number portability (or LNP – Local Number Portability) is the ability to keep your existing phone number when switching to a different telecommunications carrier. In Australia, phone and internet setup services (Australian Communications and Media Authority) mandates number portability for both mobile numbers and landline numbers (fixed-line number portability, FLNP). Porting a mobile number typically takes 24–72 hours; during the brief cut-over, calls may be disrupted. Key points: you can keep your number when moving between Telstra, Optus, Vodafone, and any MVNO (Mobile Virtual Network Operator like Boost Mobile, Amaysim, Woolworths Mobile); porting does not require your current carrier’s cooperation (your new carrier manages the port); and porting cancels your existing contract with your old carrier (check for early termination fees). See also: SIM Card, VoIP, ISP.
Numeric Keypad / Numpad
A numeric keypad (numpad) is the grid of number keys on the right side of a full-sized keyboard, arranged like a calculator, designed for fast numerical data entry. Many compact and laptop keyboards omit the numpad to save space. Standalone USB or Bluetooth numpads are available for users who need fast number input but use a compact keyboard. The Num Lock key toggles the numpad between number entry mode and navigation mode (arrow keys, Home, End, Page Up/Down). Accountants, data entry workers, and anyone entering large amounts of numerical data significantly benefit from a numpad. See also: Keyboard (Peripheral), USB, Bluetooth.
NVMe (Non-Volatile Memory Express) SSD
NVMe is a high-performance storage interface protocol designed specifically for SSDs, connecting directly to the CPU via PCIe lanes on the M.2 slot. This bypasses the slower SATA interface, delivering dramatically faster speeds. SATA SSD: ~500–600 MB/s sequential read; NVMe PCIe 3.0 SSD: ~3,500 MB/s; NVMe PCIe 4.0 SSD: ~7,000 MB/s; NVMe PCIe 5.0 SSD: ~14,000 MB/s. For most users, PCIe 4.0 NVMe offers real-world performance more than sufficient for all tasks. PCIe 5.0 is currently most beneficial for data centre and professional workloads. NVMe SSDs dramatically reduce boot times, application load times, and large file operations. See also: SSD, Hard Drive (HDD), PCIe, Motherboard.
NVR / DVR (Security Recording Systems)
NVR (Network Video Recorder) and DVR (Digital Video Recorder) are dedicated devices that record and store security camera footage: DVR (analogue) – connects to traditional analogue CCTV cameras via coaxial cables; the DVR does the video encoding; limited resolution compared to IP systems; requires separate coaxial cabling to each camera. NVR (network-based) – connects to IP cameras over Ethernet or Wi-Fi; the camera does its own encoding; supports much higher resolutions; cameras can be located anywhere on the network. POE NVR – includes built-in PoE switch ports, powering and connecting IP cameras through a single Ethernet cable. security camera data recovery (typically surveillance-grade HDDs rated for 24/7 operation – Seagate SkyHawk, Western Digital Purple). Capacity planning: 1080p continuous recording at typical compression uses approximately 10–20GB per camera per day. Cloud recording vs local: local NVR/DVR footage is private and has no ongoing subscription; cloud recording (Ring, Arlo, Eufy) requires subscription and stores footage on vendor servers. See also: IP Camera, Hard Drive (HDD), Power over Ethernet (PoE).
Object Storage
Object storage is a data storage architecture that manages data as discrete objects – each containing the data itself, metadata (information about the data), and a unique identifier – rather than as files in a hierarchy (file system) or blocks (block storage). Object storage is highly scalable, designed to hold vast amounts of unstructured data (photos, videos, backups, logs, machine-generated data) and accessed via API (typically HTTP). Amazon S3 (Simple Storage Service) pioneered modern object storage and remains the dominant platform; Azure Blob Storage and Google Cloud Storage are the other major players. Consumer object storage products include cloud backup services and photo storage. Object storage enables practically unlimited storage capacity without the complexity of managing file systems. See also: Cloud Computing, Cloud Backup, API.
OBS / Screen Recording
OBS Studio (Open Broadcaster Software) is the free, open-source industry standard for screen recording and live streaming on Windows, macOS, and Linux. It supports: screen capture (entire desktop or specific windows/applications); webcam and capture card inputs; multiple simultaneous sources arranged in “scenes”; real-time audio mixing; live streaming to Twitch, YouTube, Facebook Live, and any RTMP endpoint; and local recording in various formats. OBS is used by gamers, content creators, educators, and IT professionals for video tutorials. Simpler screen recording alternatives: Windows Game Bar (Win+G – built into Windows 10/11); Xbox Game Bar (Win+Alt+R to start recording); macOS built-in (Cmd+Shift+5); ShareX (free, powerful Windows alternative to OBS for screenshots and recording). Capture card – a device that connects gaming consoles or external cameras to a computer for capture; popular brands: Elgato, AVerMedia. See also: Streaming, GPU, Codec, Webcam.
OCR (Optical Character Recognition)
Optical Character Recognition is technology that analyses an image (typically a scanned document or photograph) and converts the visual representation of text into actual, editable, searchable text. This transforms a scanned PDF from an image (where you cannot select or search text) into a text-containing document. OCR is built into most modern scanner software; also available in Adobe Acrobat, Microsoft Office Lens, Google Drive (can OCR PDFs), and dedicated apps like ABBYY FineReader. OCR accuracy depends on: scan resolution (300 DPI minimum for reliable results), document quality, font clarity, and language. Modern AI-powered OCR handles handwriting, multiple languages, complex layouts, and poor-quality documents far better than older systems. See also: Scanner, PDF, AI Computing.
OLED (Organic Light-Emitting Diode)
OLED is a display technology where each individual pixel generates its own light, eliminating the need for a separate backlight (as used in LCD screens). This produces: true blacks (pixels simply switch off), near-infinite contrast ratios, faster response times, wider colour gamut, and better viewing angles than LCD. OLED is used in: premium smartphones (iPhone Pro, Samsung Galaxy S/Z series), high-end TVs (LG OLED, Sony Bravia XR), and an expanding range of laptops and monitors. QD-OLED (Quantum Dot OLED) and WOLED are variants offering even higher brightness. The main disadvantages of OLED are: susceptibility to burn-in from static image elements, historically higher cost (though falling rapidly), and lower peak brightness compared to high-end LCD. See also: LCD, Monitor, 4K / 8K Resolution.
Online Learning / eLearning Platforms
Online learning platforms have made education and professional development accessible anywhere, anytime. Categories: MOOC platforms (Massive Open Online Courses): Coursera (university courses and professional certificates, with paid certificates), edX (MIT, Harvard and others), FutureLearn (UK-oriented); Skills platforms: LinkedIn Learning (professional skills, integrated with LinkedIn profile; accessible free via many Australian public libraries); Udemy (huge course range, frequent discounts to $15–20 AUD; lifetime access); Pluralsight (technology-focused, subscription); Skillshare (creative skills); Vendor-specific learning: Microsoft Learn (free, Microsoft 365 and Azure); Google Skillshop (Google Ads, Analytics); AWS Training; Cisco Networking Academy; Australian platforms: TAFE Online; Open Universities Australia; AI-powered learning: Duolingo (languages), Khan Academy (school subjects). Many Australian public libraries provide free access to LinkedIn Learning and similar platforms with a library card. See also: Digital Literacy, Cloud Computing, AI Chatbot.
Common Online Scam Types in Australia
Australian scam losses are among the highest per capita in the world. The most common scam types: Investment scams – the biggest category by dollar loss; fake investment platforms, cryptocurrency schemes, “pig butchering” scams (building a relationship over months then introducing fake investment opportunities); Romance scams – building a fake relationship online then requesting money (often for a “crisis”); Phishing – impersonating the ATO, banks, Australia Post, myGov, Telstra; Tech support scams – fake Microsoft/Telstra/NBN calls; Job scams – fake employment offers requesting personal information or asking victims to process payments; Rental scams – fake property listings on Facebook Marketplace and Gumtree; Product scams – items paid for but never delivered; Classified scams – fake buyers overpaying with fraudulent cheques; Grandparent/family emergency scams – impersonating a family member in trouble; Fake charity scams – particularly after disasters. Most scams share warning signs: urgency, secrecy, unusual payment methods (gift cards, crypto, wire transfer), and deals too good to be true. See also: Scamwatch, Phishing, Romance Scam, Investment Scam.
OOP (Object-Oriented Programming)
Object-Oriented Programming is the dominant programming paradigm that organises code around “objects” – bundles of data (attributes) and behaviours (methods) that represent real-world entities. Key OOP concepts: Class – a blueprint or template for creating objects (e.g., a “Car” class defines that all cars have a colour and can accelerate); Object – a specific instance of a class (the red Toyota in your driveway is an instance of Car); Encapsulation – hiding internal details and exposing only necessary interfaces; Inheritance – a subclass inherits properties and methods from a parent class (ElectricCar inherits from Car); Polymorphism – objects of different types can be used interchangeably through a common interface. OOP is used in software and IT consultancy, C++, Swift, and most mainstream languages. See also: Programming Language, Algorithm, IDE.
OpenAPI / Swagger
OpenAPI (formerly known as Swagger) is a standard specification for describing REST APIs in a machine-readable format (JSON or YAML). An OpenAPI document describes every API endpoint, the data structures it accepts and returns, authentication requirements, and example requests and responses. Benefits: Auto-generated documentation (Swagger UI renders interactive API docs from the spec, allowing developers to test endpoints in a browser); client SDK generation (code generators produce client libraries in dozens of languages from the spec); API testing (tools like Postman can import OpenAPI specs); and contract-first development (the spec becomes the agreement between frontend and backend teams). Most public APIs (Stripe, Twilio, GitHub, Anthropic’s Claude API) publish OpenAPI specifications. See also: API, REST API / GraphQL, Cloud Computing.
Open Banking / Consumer Data Right (CDR)
Open Banking is a financial services framework that allows consumers to securely share their financial data (transaction history, account balances, product holdings) with accredited third-party applications through standardised APIs. In Australia, this is implemented through the Consumer Data Right (CDR), regulated by the ACCC and data standards set by Data Standards Australia. With your permission, accredited apps can: access your banking transaction history to provide budgeting insights; compare your current products against alternatives (mortgages, credit cards, utilities); automate accounting (Xero, MYOB can pull bank transactions directly); and streamline loan applications (lenders can verify income directly). CDR coverage: banking was first (all major banks are participating); energy and telecommunications are next. Security: you only share read access (apps cannot move money); sharing is always consent-based; you can revoke access at any time; accredited businesses meet strict ACCC and ASIC security requirements. See also: API, Fintech, Privacy Act.
Open Source Software
Open source software is software whose source code is publicly available for anyone to view, use, modify, and distribute. The “open” aspect refers to the openness of the development process and code, not necessarily that it’s free of cost. Well-known open source projects include: Linux (operating system), Firefox (browser), Android (mobile OS), LibreOffice (office suite), WordPress (website platform), Python (programming language), VLC (media player), and many of the tools powering cloud computing (Docker, Kubernetes, Nginx). Open source is contrasted with proprietary (closed source) software where the source code is secret (Microsoft Windows, Adobe Photoshop). Freeware is software available at no cost but not necessarily open source. Shareware is software you can try free but must pay to continue using. See also: Linux, Browser.
OS (Operating System)
The operating system is the foundational software that manages all hardware resources and provides the environment in which all applications run. It acts as the intermediary between software and hardware, managing memory allocation, file storage, process scheduling, input/output, networking, and security. The dominant operating systems are: Windows 11 (Microsoft, most widely used on desktops and laptops); Apple Mac repairs and service Sequoia (Apple, for Mac computers); Linux (open source, dominant on servers and growing on desktops); Android (Google, most widely used mobile OS globally); iOS/iPadOS (Apple, for iPhone and iPad); Chrome OS (Google, for Chromebooks). See also: BIOS / UEFI, Windows Updates, Linux, Driver.
OTA Update (Over-the-Air Update)
An OTA update is a software update that is downloaded and installed wirelessly over the internet, without requiring a physical cable connection to a computer. OTA updates are now the standard delivery method for operating system updates, app updates, and firmware updates on smartphones, tablets, smart TVs, gaming consoles, routers, and IoT devices. When your iPhone prompts “iOS update available” or your Android phone says “System update available” – those are OTA updates. Best practices: professional computer maintenance and update services (they often contain critical security patches); ensure you have sufficient battery (typically above 50% or connected to power); and have enough storage space. Some router and device OTA updates happen automatically in the background. See also: Firmware, Windows Updates, IoT.
Overclocking
Overclocking is the practice of running a computer component (typically a CPU, GPU, or RAM) at clock speeds higher than the manufacturer’s official specifications, in order to extract additional performance without buying faster hardware. For example, overclocking a CPU rated at 3.6 GHz to run at 4.2 GHz. Benefits include free performance gains; risks include increased heat generation (requiring better cooling solutions), reduced component lifespan, system instability, and voided warranties. Modern Intel and AMD processors (particularly K and X-series CPUs) and NVIDIA/AMD GPUs are overclocking-friendly. RAM overclocking (called XMP or EXPO profiles on modern systems) is simpler and widely used. Overclocking is only relevant for users who build or heavily customise their own PCs. See also: CPU, GPU, Thermal Throttling.
Overwrite / Secure Erase
When a file is deleted in Windows, the data is not immediately removed – the file system marks the space as available, but the actual data remains until new files are written on top of it. This is why deleted files can be recovered. Overwriting means writing new data over the space previously occupied by deleted files, making the original data unrecoverable (or much harder to recover). A secure erase deliberately overwrites storage space to prevent recovery – a single pass of zeros is sufficient for modern drives; older guidance recommended multiple passes (DoD 5220.22-M standard used 7 passes) but this is now considered unnecessary for modern HDDs and counterproductive for SSDs. For SSDs, the ATA Secure Erase command instructs the drive’s firmware to reset all cells simultaneously. See also: Data Recovery, TRIM, Degausser.
Packet / Packet Switching
When data travels across the internet, it is divided into small chunks called packets – typically up to 1,500 bytes each. Each packet contains: a header (destination IP address, source IP address, sequence number, and error-checking information) and a payload (the actual data). Packets from the same data transmission may travel via different routes across the internet and are reassembled in the correct order at the destination by the receiving computer using the sequence numbers. This is called packet switching – the fundamental architecture of the internet. Why not send one continuous stream? Packet switching is more efficient (multiple conversations share the same infrastructure), more resilient (packets reroute around failures), and easier to scale. Packet loss (packets not arriving) causes stuttering in video calls and degraded internet performance. See also: Protocol, Latency, IP Addressing.
Parental Controls
Parental controls are software tools and settings that allow parents or guardians to manage, monitor, and restrict what children can access and do on digital devices. Features include: web content filtering (blocking inappropriate websites); screen time limits (restricting usage hours and daily time limits); app and game restrictions (preventing installation or use of age-inappropriate apps); location tracking; activity reports; and communication controls. On Windows, parental controls are built into Microsoft Family Safety (linked to Microsoft accounts). On macOS/iOS, Screen Time provides comprehensive controls. Third-party solutions like Bark, Qustodio, and Circle offer cross-platform management. DNS-based filtering (e.g., Cloudflare for Families, CleanBrowsing) can block inappropriate content at the network level, covering home computer setup and security without per-device configuration. See also: DNS, User Account, Router.
Parental Monitoring Apps vs Stalkerware
There is an important distinction between transparent parental monitoring and covert stalkerware: Legitimate parental monitoring apps are designed to be known to the child; they typically include age-appropriate features like content filtering, screen time limits, location sharing (child knows about it), and social media monitoring. Parents are expected to discuss these tools openly with children as part of parental controls and family device setup. Examples: Apple Screen Time (built-in), Google Family Link (built-in Android), Bark (monitors for concerning content and alerts parents rather than giving raw surveillance), Qustodio, Circle. Stalkerware is covertly installed without the target’s knowledge, hidden from the device, and used for control rather than protection. Installing stalkerware on a partner’s device without consent is illegal in many Australian jurisdictions under stalking and telecommunications interception laws. See also: Parental Controls, Stalkerware, Screen Time.
Partition
A partition is a logically separated, independently accessible section of a physical storage drive. Partitioning divides one physical drive into multiple sections that appear to the operating system as separate drives (e.g., C: and D: drives). Common partitioning schemes: A typical Windows installation creates: a small EFI System Partition (for UEFI boot files), a Microsoft Reserved Partition, the main Windows partition (C:), and a Recovery partition. Users often create additional partitions to separate the OS (C:) from data (D:) so reinstalling Windows doesn’t erase their files. Partition information is stored in the MBR or GPT partition table. Accidental partition deletion or corruption causes the entire partition to become invisible, though data typically remains and is recoverable with partition recovery tools. See also: MBR / GPT, File System, Data Recovery.
Passphrase
A passphrase is a password composed of multiple words strung together, rather than a single complex word with character substitutions. The concept was popularised by the XKCD comic “correct horse battery staple” (2011). Why passphrases are better than complex short passwords: a 4-word random passphrase (e.g., “purple-coffee-launch-orbit”) has approximately 44 bits of entropy – comparable to a random 8-character password with full character set; it is far easier to remember; and it is easier to type on mobile devices. An 8-character complex password like “P@ssw0rd!” is weaker than it looks because humans choose predictable patterns. NIST guidelines (the US government’s password standards, widely adopted globally) now recommend: cybersecurity best practice advice; passphrases over complex short passwords; do not require frequent mandatory changes (which encourages weak incremental passwords); and check against known breach lists rather than arbitrary complexity rules. The best of all worlds is a long random passphrase stored in a password manager. See also: Password Manager, Password Hygiene, Multi-Factor Authentication (MFA).
Password Hygiene / Passphrases
Good password practices are the foundation of personal cybersecurity. The modern approach to passwords: Never reuse passwords – if one site is breached, all accounts with the same password are compromised; use a unique password for every account. Length over complexity – a long passphrase (four random words: “correct-horse-battery-staple”) is far more secure than a short complex password (“P@ssw0rd!”) because length exponentially increases cracking time. Use a password manager – the only practical way to have unique, strong passwords for every account; generates and stores them for you. Don’t use personal information – names, birthdays, pet names, and addresses are easily guessed from social media. Don’t use keyboard patterns – “qwerty,” “123456,” “password” are in every attack dictionary. Highest priority accounts to protect: email (can be used to reset all others), banking, Apple ID/Google account. protect yourself from account compromises (haveibeenpwned.com) – check if your email or passwords have appeared in known breaches. See also: Password Manager, Multi-Factor Authentication (MFA), Data Breach, Credential Stuffing.
Password Manager
A password manager is an application that securely stores, generates, and auto-fills strong, unique passwords for every website and app you use. Without a password manager, most people reuse the same few passwords across multiple sites – which means if one site is breached, all their accounts are at risk (credential stuffing attacks). A password manager solves this by generating and remembering a unique, complex password for every account – you only need to remember one master password. Top password managers include Bitwarden (open source, highly recommended), 1Password, Dashlane, and Keeper. Most browsers also have built-in password managers. Features to look for: end-to-end encryption, cross-platform sync, breach monitoring (alerts when a saved password appears in a known breach), secure sharing, and passkey support. See also: Multi-Factor Authentication (MFA), Cybersecurity, Phishing.
Password Spraying / Credential Stuffing
Two related but distinct credential attack techniques: Password spraying is the opposite of brute force – instead of trying many passwords against one account (which triggers lockouts), attackers try one common password (e.g., “Password1!”) against thousands of accounts. This avoids account lockout policies. Often combined with public breach data to target valid usernames. Credential stuffing uses lists of username/password combinations obtained from data breaches and tries them against other services – exploiting the common habit of password reuse across multiple sites. Billions of credentials are available on dark web marketplaces. A single data breach at one website can lead to your bank, email, and social media accounts being compromised if you use the same password. Defences: professional cybersecurity setup (use a password manager), MFA on all important accounts, and monitoring for breach notifications. See also: Password Manager, Multi-Factor Authentication (MFA), Data Breach, Dark Web.
Patch Management
Patch management is the systematic process of identifying, acquiring, testing, and installing software updates (patches) to computer systems and applications to fix security vulnerabilities, bugs, and performance issues. Unpatched software is one of the most common causes of successful cyberattacks – the majority of major breaches exploit vulnerabilities for which patches were already available. A mature patch management process includes: automated discovery of all software and versions in use; prioritisation based on vulnerability severity (using CVSS scores); testing patches before wide deployment; deployment to all systems within defined time windows; and verification that patches were successfully applied. In Australia, the ACSC’s Essential Eight security framework lists patching as one of the eight most important cybersecurity controls. See also: Windows Updates, Zero-Day Vulnerability, Cybersecurity, Managed IT Services.
PayID / NPP (New Payments Platform)
PayID is an easy-to-remember identifier (your mobile number, email, or ABN) that is linked to your Australian bank account, enabling instant payments to be made without needing to know the recipient’s BSB and account number. PayID is built on the NPP (New Payments Platform), Australia’s modern real-time payment infrastructure launched in 2018, replacing slow overnight batch processing with instant (under 1 minute) 24/7 payment transfers. NPP is used by all major Australian banks. Osko is the consumer-facing brand name for PayID payments between banks. PayID scam warning: scammers may attempt to convince you that a large payment has been sent to you (fake PayID receipt), inducing you to transfer goods before realising no payment was received. Always PayID and payment scam protection guide before releasing goods. See also: Digital Wallet, Phishing, NFC.
PBX (Private Branch Exchange)
A PBX is a private telephone exchange within a business that manages internal calls between extensions and routes incoming/outgoing calls to the public phone network. A PBX allows: internal calls between extensions (free, within the building); shared phone lines (many extensions sharing fewer external lines); features like call transfer, hold, conference calling, voicemail, and auto-attendant (IVR menus); and hunt groups (ringing multiple extensions before going to voicemail). Traditional PBX systems used dedicated physical hardware. IP PBX systems run over the company’s IP network using VoIP. Cloud PBX / Hosted PBX (like VoIP and PBX setup for Australian businesses Cloud, RingCentral, 8×8) moves the PBX infrastructure to the cloud, eliminating on-premises hardware and providing mobile apps, remote extensions, and advanced analytics. In Australia, 3CX is particularly popular with small and medium businesses. See also: VoIP, Managed IT Services, Cloud Computing.
PCB (Printed Circuit Board – Hard Drive)
The PCB (Printed Circuit Board) is the green electronic circuit board attached to the underside of a hard drive (or connected to an SSD module). The drive’s PCB contains: the main controller chip; motor driver chips (controlling the spindle motor and voice coil actuator); flash memory chips storing the drive’s firmware and adaptive parameters specific to that drive; and interface chips (SATA or USB). PCB failure is a common cause of hard drive failure and is identifiable by: the drive making no sound at all when powered on, a burning smell, or visible component damage (burnt resistors, capacitors). Critical warning: unlike what many DIY guides suggest, swapping a PCB from a matching donor drive will not work for modern HDDs without also transferring the drive’s unique firmware data (stored in ROM chips on both the PCB and the platters). This is a procedure requiring our professional data recovery service. See also: Data Recovery, Donor Drive, Cleanroom.
PCIe (Peripheral Component Interconnect Express)
PCIe is the standard high-speed interface on the motherboard used to connect expansion cards – most importantly GPUs, NVMe SSDs, network cards, and capture cards. PCIe consists of “lanes” (x1, x4, x8, x16) with more lanes providing more bandwidth. Generations (PCIe 3.0, 4.0, 5.0, 6.0) double the bandwidth with each generation. A PCIe 5.0 x16 slot (used by modern high-end GPUs) provides approximately 128 GB/s of theoretical bandwidth. Understanding PCIe is important when upgrading components – a new GPU may require a PCIe 4.0 or 5.0 slot to perform optimally, and an NVMe SSD in a PCIe 3.0 slot will be limited to PCIe 3.0 speeds even if the drive supports PCIe 4.0. See also: Motherboard, GPU, NVMe SSD.
PDF (Portable Document Format)
A PDF is a universal document file format created by Adobe that preserves the exact visual layout of a document – fonts, images, formatting – regardless of what device, operating system, or software is used to open it. PDFs look identical on a Mac, Windows PC, iPhone, or Android device. This makes them ideal for forms, invoices, contracts, manuals, ebooks, and official documents. Most browsers and operating systems can open PDFs without additional software. PDFs can be created from any program by “printing to PDF” (available as a printer option in Windows and Mac). Fillable PDFs contain form fields you can type into before saving. Password-protected PDFs require a password to open or to modify. See also: File Extension, Cloud Backup.
Advanced Mobile Spyware (Pegasus)
Pegasus is a sophisticated commercial spyware tool developed by the Israeli cyber intelligence company NSO Group, marketed to government clients for “lawful interception.” However, investigations by professional security advice found it deployed against journalists, human rights defenders, lawyers, and political dissidents in multiple countries. Pegasus is notable for using zero-click exploits – it can silently compromise a phone without the target clicking any link; simply receiving a specially crafted iMessage or WhatsApp call was sufficient. Once installed, Pegasus can access all data on the device: messages, emails, calls, photos, microphone, camera, location. Apple has released emergency patches for Pegasus-exploited vulnerabilities and created Lockdown Mode (iOS 16+) specifically to protect high-risk users. If you believe you may be targeted by nation-state spyware (you are a journalist, activist, or human rights defender), Amnesty’s Mobile Verification Toolkit (MVT) can check for indicators of compromise. See also: Zero-Day Vulnerability, Spyware, iPhone Security, Stalkerware.
Penetration Testing / Ethical Hacking
Penetration testing (pen testing) is a security practice where cybersecurity professionals are authorised to attempt to hack into an organisation’s systems, networks, and applications – using the same tools and techniques as malicious attackers – in order to identify and fix vulnerabilities before criminals can exploit them. A pen tester might try to break into a company’s network, exploit a web application vulnerability, test whether staff can be tricked by simulated phishing, or attempt physical access. The key distinction from criminal hacking is written authorisation. Certifications in this field include OSCP (Offensive Security Certified Professional), CEH (Certified Ethical Hacker), and CompTIA PenTest+. Australian businesses can engage pen testing firms under the our business cybersecurity services (ACSC) guidelines. See also: Cybersecurity, Vulnerability / Zero-Day, Phishing.
Peripheral
A peripheral is any external device connected to a computer to extend its capabilities – it is not part of the core computer itself. Peripherals are categorised as: Input devices – keyboards, mice, trackpads, drawing tablets, webcams, microphones, scanners, game controllers; Output devices – monitors, printers, speakers, headphones, projectors; and Storage devices – external hard drives, USB flash drives, memory card readers. Peripherals connect via USB, Bluetooth, Wi-Fi, HDMI, DisplayPort, Thunderbolt, or (for older devices) PS/2, serial, or parallel ports. See also: USB, Bluetooth, Monitor.
Phishing
Phishing is a type of social engineering cyberattack where criminals impersonate trusted organisations or individuals to trick victims into revealing sensitive information or performing actions like clicking malicious links or making fraudulent payments. Variants include: Email phishing (mass-targeted fake emails from banks, ATO, Australia Post, myGov, Telstra); Spear phishing (highly targeted attacks using personalised information about the victim); Smishing (phishing via SMS); Vishing (phishing via voice calls); Quishing (phishing via malicious QR codes). Warning signs: urgency or threats; unusual sender addresses; hover-to-check URL doesn’t match claimed organisation; requests for credentials, payments, or personal data. Never click links in unsolicited emails – go directly to the official website. protect yourself from tech support scams to the ACSC at ReportCyber (cyber.gov.au). See also: Cybersecurity, Social Engineering, Multi-Factor Authentication (MFA), Password Manager.
SMS Phishing (Smishing) / Phone Call Scams (Vishing)
Smishing (SMS phishing) involves fraudulent text messages impersonating trusted organisations to trick recipients into clicking malicious links or revealing personal information. Common Australian smishing impersonations: Australia Post parcel delivery notifications; ATO tax refund or debt notices; myGov account alerts; bank fraud alerts; Centrelink payment notifications; and toll road unpaid invoice notices. The fraudulent link leads to a convincing fake website that steals login credentials or installs malware. Vishing (voice phishing) involves phone calls from fraudsters impersonating the ATO, police, Medicare, banks, NBN, Telstra, or Microsoft claiming your account is compromised, you owe a debt, or your computer has been hacked. Warning signs: urgency; threats of arrest or account closure; requests for gift cards, cryptocurrency, or wire transfers; remote access requests. Rule: never click links in unexpected texts; call organisations directly using numbers from their official websites. protect yourself from SMS and phone scams (scamwatch.gov.au) or 1300 723 628. See also: Phishing, Tech Support Scam, Mobile Banking Security.
Phone Security Checklist
A comprehensive security review every smartphone user should perform: Lock screen – always use a strong PIN (6+ digits), biometric (Face ID, fingerprint), or pattern; never use no lock or a simple swipe; OS updates – install all iOS or Android updates immediately; many attacks target unpatched phones; App updates – enable automatic app updates; App permissions – review what each app can access (location, camera, microphone, contacts); revoke unnecessary permissions; Two-factor authentication – enable on all important accounts (email, banking, Apple ID, Google account); use an authenticator app rather than SMS; Unknown sources – never enable “Install unknown apps” on Android unless you have a specific verified reason; Public Wi-Fi – use a VPN on public networks; Bluetooth – disable when not in use; Encrypted backups – ensure iPhone backups (iCloud or iTunes/Finder) are encrypted; SIM PIN – set a PIN on your SIM card to prevent SIM swapping. See also: Multi-Factor Authentication (MFA), SIM Card, VPN, Phone Has Been Hacked.
Mobile Phone Backup (iPhone and Android)
Regularly backing up your phone ensures you don’t lose contacts, photos, messages, and app data if your phone is lost, stolen, broken, or factory reset. iPhone backup methods: iCloud Backup – automatic daily backup over Wi-Fi; back up to iCloud (Settings > [your name] > iCloud > iCloud Backup > Back Up Now); restores everything when setting up a new iPhone. Mac/PC backup via Finder or iTunes – creates a local backup on your computer; select “Encrypt local backup” to include health data, passwords, and WiFi settings. Android backup methods: Google One Backup – backs up contacts, calendar, photos (Google Photos), app data, SMS, and device settings to Google account; Settings > System > Backup. Samsung Cloud / Smart Switch – for Samsung devices. Google Photos – backs up all photos and videos; free with 15GB shared storage. Before performing a factory reset, professional data recovery if backup fails and restorable. See also: Cloud Backup, iCloud, Factory Reset.
Signs Your Phone Has Been Hacked
Recognising the warning signs of a compromised phone is the first step to recovery. Common indicators that your smartphone may have been hacked or infected with malware: Battery draining unusually fast – spyware and malware running in the background consume power constantly; Data usage spike – check Settings > Mobile Data (iOS) or Settings > Network > Data Usage (Android) for apps consuming unexpected amounts of data (they may be uploading your data); Phone running hot when not in use – background malicious processes generate heat; Unfamiliar apps appearing that you didn’t install; Strange messages sent from your accounts that you didn’t send; Unusual account activity – unknown logins on email, social media, or banking apps; Unexpected charges on phone bills or bank accounts; Microphone / camera indicator appearing unexpectedly; Browser redirects to unfamiliar websites; and Phone behaving oddly – calls disconnecting, odd noises, screen lighting up alone. See also: Malware, Spyware, Phone Security Checklist, Factory Reset.
What To Do If Your Phone Is Stolen
Acting quickly after a phone theft dramatically limits damage. Immediate steps in order of priority: 1. Remotely lock the device – iPhone: iCloud.com > Find My > select device > Mark as Lost (locks with PIN, displays message); Android: android.com/find > Lock device. 2. Remotely erase if necessary – only if you have no hope of recovery; erasing permanently wipes data but also disables the ability to track it. 3. Change passwords immediately – your email account first (as email is used to reset all other accounts), then banking, Apple ID/Google account, social media. 4. Contact your carrier – report the theft; request the SIM be blocked; report the IMEI for blacklisting. 5. Enable two-factor authentication on new device using a backup method. 6. Contact your bank – report any fraud; request new cards if banking details may be compromised. 7. Report to police – obtain a report number for insurance purposes. what to do after phone theft or hacking yourself. See also: Find My, IMEI, SIM Card, Factory Reset.
Photonic Computing / Light-Based Computing
Photonic computing uses photons (particles of light) rather than electrons to process and transmit information. Because photons travel at the speed of light, generate minimal heat, and can carry enormous amounts of data simultaneously through different wavelengths (wavelength division multiplexing), photonic computing promises dramatic speed and energy efficiency improvements over conventional electronic processors. Current applications: fibre optic data transmission (already photonic); photonic interconnects within data centres (replacing copper cables for chip-to-chip communication); and photonic AI accelerators (companies like Lightmatter and Lightelligence are building photonic chips for matrix multiplication, critical for AI). Photonic computing is complementary to quantum computing – some quantum computers use photons as qubits. Australia, with its renewable energy advantages and strong research base, is positioned as a potential photonic computing hub. See also: Quantum Computing, AI Computing, GPU.
Physical Failure – See: Logical Failure vs Physical Failure
Ping / Traceroute (Network Diagnostic Tools)
Ping is a command-line network utility that sends ICMP echo request packets to a target host and measures the round-trip time (latency) in milliseconds. If the host is unreachable, ping reports a timeout. Ping is used to verify basic connectivity and measure latency. Usage: open network diagnostics and internet troubleshooting (Windows) or Terminal (Mac/Linux) and type ping google.com. Traceroute (Windows: tracert) traces the path data takes from your computer to a destination, showing each “hop” (router or gateway along the way) and the latency to each hop. Traceroute is invaluable for diagnosing where in the network path a connection problem occurs – whether at your home router, your ISP, or further along the route. These tools are free, built into every operating system, and are the first diagnostic tools used by network engineers and technicians. See also: Latency, DNS, Network, Bandwidth.
Pixel (Picture Element)
A pixel is the smallest individual element of a digital image or display. Every digital image and screen is made up of a grid of millions of tiny coloured dots (pixels). Each pixel on a colour display consists of three sub-pixels (red, green, and blue) whose intensities are mixed to produce the full colour spectrum. Resolution describes the total number of pixels in an image or on a display (e.g., 1920 × 1080 = approximately 2 million pixels for 1080p; 3840 × 2160 = approximately 8.3 million pixels for 4K). Pixel density (measured in PPI – pixels per inch) affects perceived sharpness. Apple’s “Retina” displays target pixel densities high enough that individual pixels are indistinguishable at normal viewing distances. See also: 4K / 8K Resolution, Monitor, GPU.
Plugin / Extension / Add-on
A plugin (also called an extension or add-on) is a small piece of additional software that enhances or extends the functionality of a larger program. Browser extensions add features to your web browser – popular examples include ad blockers (uBlock Origin), password managers (Bitwarden, 1Password), grammar checkers (Grammarly), and screenshot tools. They are installed from the browser’s extension store (Chrome Web Store, Microsoft Edge Add-ons). WordPress plugins add features to a WordPress website. Office add-ins extend Microsoft Office applications. Extensions should be kept to a minimum as too many can slow the browser and some malicious extensions can spy on your browsing. Only install extensions from trusted, reputable sources. See also: Browser, Malware.
Podcast / RSS
A podcast is a series of digital audio (or video) episodes that listeners can download or stream on demand. The term combines “iPod” and “broadcast.” Technical basis: podcasts use RSS (Really Simple Syndication) – an XML-based web feed format that podcast apps use to subscribe to shows; when a new episode is published, the podcast host updates the RSS feed, and apps automatically download new episodes for subscribers. Creating a podcast requires: a microphone; recording and editing software (Audacity, GarageBand); podcast hosting platform (generates and hosts the RSS feed – Buzzsprout, Podbean, Libsyn, Spotify for Podcasters (formerly Anchor, free)); and optionally distribution to Apple Podcasts, Spotify, and Google Podcasts. RSS is also used by news websites, YouTube channels, and blogs to distribute content to feed readers (Feedly, NetNewsWire). Despite being a 1990s technology, RSS remains the open standard underpinning the entire podcast ecosystem. See also: DAW, Streaming, Cloud Computing.
Power over Ethernet (PoE)
Power over Ethernet is a technology that allows network cables (standard Ethernet/RJ45 cables) to carry electrical power to devices, eliminating the need for separate power adapters and power outlets. PoE is widely used for: IP security cameras, VoIP phones, wireless access points, network switches in remote locations, smart building sensors, and LED lighting. PoE standards include: PoE (IEEE 802.3af) – up to 15.4W per port; PoE+ (802.3at) – up to 30W; PoE++ (802.3bt) – up to 60W or 100W for higher-powered devices. A PoE switch or PoE injector provides the power source. The benefit is significant simplification of installations – one cable handles both data and power. See also: Ethernet, Network Switch, IoT.
Pop-up / Pop-up Window
A pop-up is a window that appears suddenly over the current screen, often without being directly requested. Pop-ups have legitimate uses: website cookie consent dialogs, login prompts, calendar alerts, software update notices, and subscription offers. However, malicious pop-ups are common: fake virus alerts claiming your computer is infected and urging you to call a “support number” (a tech support scam protection guide), browser hijackers constantly displaying advertising, and phishing pop-ups attempting to steal login credentials. If you see a pop-up claiming your computer has a virus and providing a phone number – this is a scam; close it immediately (use Alt+F4 or Task Manager if it won’t close). Legitimate antivirus software does not ask you to call a phone number. See also: Tech Support Scam, Browser, Malware.
Port / Port Forwarding
A network port is a virtual endpoint for network communication, identified by a number (0–65535). Different services use specific ports: HTTP uses port 80; HTTPS uses port 443; email (SMTP) uses port 25; SSH uses port 22; gaming servers use custom ports. When data arrives at a router’s public IP address, the port number tells the router and firewall which service or computer on the local network it’s destined for. Port forwarding is the process of configuring your router to send traffic arriving on a specific external port to a specific device inside your network. Uses include: hosting a game server at home; remote desktop access to a specific computer; running a web server; and accessing a security camera remotely. Opening ports creates security risks and should be done carefully. See also: Router, Firewall, IP Addressing, Protocol.
DisplayPort Multi-Stream Transport / Daisy Chaining
DisplayPort Multi-Stream Transport (MST) allows a single DisplayPort connection to carry signals for multiple monitors, which are then chained together – the output of one monitor connects to the input of the next. This enables multiple monitor setups using just one DisplayPort cable from the GPU rather than separate cables for each monitor. For example: PC → Monitor 1 (DisplayPort in → DisplayPort out) → Monitor 2 → Monitor 3. MST requires: a GPU with DisplayPort MST support; monitors with DisplayPort 1.2+ In and Out ports; and daisy-chaining enabled in monitor settings. Total bandwidth is shared across all monitors in the chain. Thunderbolt 3/4 also supports daisy-chaining up to six devices. This simplifies cable management significantly for multi-monitor workstations. See also: DisplayPort, Thunderbolt / USB-C, Monitor, GPU.
POS (Point of Sale)
A Point of Sale system is the hardware and software used to process transactions when customers purchase goods or services. Modern POS systems have evolved far beyond cash registers to become comprehensive business management tools. Components: POS software (transaction processing, inventory management, reporting); payment terminal (processing credit/debit cards, Apple Pay, Google Pay); receipt printer; barcode scanner; cash drawer; and often customer-facing display. Popular Australian POS platforms: POS system setup and IT support (widely used for small hospitality and retail), Lightspeed, Vend, Kounta, and Toast (hospitality). Cloud-based POS systems sync sales data in real-time across multiple locations. Integration with accounting software (Xero, MYOB) automates bookkeeping. See also: Barcode Scanner, NFC, Cloud Computing, Digital Wallet.
EFTPOS / Payment Terminal
EFTPOS (Electronic Funds Transfer at Point of Sale) is Australia’s domestic payment network and the ubiquitous card payment terminals found at Australian businesses. When you tap, insert, or swipe your bank card at a shop, petrol station, or restaurant, you are using the EFTPOS network. Modern Australian payment terminals support: chip-and-PIN (insert card and enter PIN); contactless/tap (under $100 no PIN required, though the limit has been raised to $200 in some contexts since COVID); Apple Pay, Google Pay, and Samsung Pay (NFC mobile payments). Australia was an early global adopter of contactless payments – over 95% of Australian in-person transactions are now contactless. EFTPOS is managed by eftpos Australia (a domestic scheme) while Visa and Mastercard operate internationally. See also: NFC, Digital Wallet, PayID, POS.
Power Cycle / Hard Restart
Power cycling means turning a device completely off and back on – removing power entirely (not just using a software restart) to clear all state and memory. For many networking and electronic devices, a power cycle is more effective than a simple restart because it: clears all volatile memory and cached states; resets hardware to its initial state; forces the device to re-initialise connections; and clears minor firmware errors that accumulate during operation. “Have you tried turning it off and on again?” – the iconic IT support advice – refers to a power cycle. For routers and modems: unplug from power, wait 30 seconds (allowing capacitors to fully discharge), then plug back in. For smartphones with frozen screens: hold the power button for 10+ seconds to force a hardware power cycle. Power cycling is the NBN and internet troubleshooting guide, router, and device problems. See also: Boot, Router, Modem, Crash.
PSU Rails / Power Connectors
A power supply unit provides electricity to components via different voltage rails and connectors. Key rail voltages: +12V – powers the CPU, GPU, and most modern components (the most important rail); +5V – powers USB ports, storage drives, and some older components; +3.3V – RAM and some logic circuits. Key connectors: 24-pin ATX – main motherboard power connector; 4+4 pin / 8-pin EPS12V – CPU power; 6+2 pin PCIe (or newer 16-pin 12VHPWR for RTX 4090-class GPUs) – GPU power; SATA power – storage drives; 4-pin Molex – legacy fans and older devices. With modern high-end GPUs consuming 300–600W, a quality PSU with adequate power delivery and good cabling is critical. See also: PSU, GPU, Motherboard.
Powerline Adapter / MoCA
When running Ethernet cable through walls is impractical but Wi-Fi range is insufficient, two technologies repurpose existing building wiring: Powerline adapters transmit network data through your home’s existing electrical wiring. You plug one adapter into a power point near your router (connected via Ethernet) and another adapter anywhere in the home (connected to the target device). The signal travels through the power circuit between them. Speeds: modern AV2 powerline adapters advertise up to 2000 Mbps but real-world performance is typically 200–500 Mbps depending on wiring quality. professional home network setup, across different circuit breakers, and in buildings with multiple phases. Brands: TP-Link, Devolo, Netgear. MoCA (Multimedia over Coax Alliance) uses existing coaxial TV cable (the same type used by Foxtel or antenna connections) to carry Ethernet signals. MoCA 2.5 supports up to 2.5 Gbps with very consistent performance. MoCA adapters require coaxial outlets at both ends. Less common in Australia than powerline but delivers more consistent performance. See also: Ethernet, Wi-Fi 6 / 6E / 7, Mesh Network.
Print Spooler / Print Queue
The print spooler is a Windows system service that manages print jobs, queuing documents for printing and sending them to the printer in the correct order. When you click Print, your document is sent to the spooler, which stores it temporarily and manages the communication with the printer. The print queue (viewable by double-clicking the printer icon in the taskbar) shows all pending print jobs and allows you to cancel, pause, or reprioritise them. A stuck print job in the queue is professional printer repair and setup – documents queue but nothing prints. The fix: open Services (services.msc), stop the Print Spooler service, delete files in C:WindowsSystem32spoolPRINTERS, and restart the service. Print spooler vulnerabilities have been a significant Windows security concern (the “PrintNightmare” vulnerability in 2021). See also: Printer, Driver, Windows Updates.
Print to PDF / PDF Tools
Printing to PDF creates a digital copy of any document or webpage in PDF format without a physical printer. On Windows 10/11: select Print from any application; choose “Microsoft Print to PDF” as the printer. On macOS: File > Print > PDF (bottom-left button) > Save as PDF. This is invaluable for: saving web pages before they change; creating PDFs from Word/Excel documents; printer setup and IT support; converting documents to universally readable format. PDF editing tools: Adobe Acrobat (industry standard; subscription or one-time purchase); Foxit PDF Editor; and built-in tools: Preview on Mac (basic annotations, filling forms, signatures), Edge browser on Windows (basic annotation). Free PDF tools: Smallpdf.com, ilovepdf.com, PDF24 – online tools for merging, splitting, compressing, rotating, and converting PDFs. PDF/A – a subset of PDF for long-term archiving of documents; used by government agencies and legal firms to ensure documents remain readable regardless of future software changes. See also: PDF, Cloud Computing, Printer.
Printer
A printer is an output device that produces physical (hard copy) documents and images from digital files. Main types: Inkjet printer – sprays tiny droplets of liquid ink onto paper; best for photo printing and colour documents; lower initial cost but higher ongoing ink cartridge costs; slower than laser; ideal for home use and small volumes. Laser printer – uses a laser beam, toner (powder), and heat to fuse images onto paper; faster, cheaper per page for black-and-white printing, longer-lasting toner; better for high-volume office use. Label printer (e.g., Dymo, Brother) – prints adhesive labels for addresses, filing, and shipping. Connectivity: USB, Wi-Fi (wireless printing from any device on the network), Bluetooth, Ethernet. Consider total cost of ownership – some cheap printers have expensive ink. See also: All-in-One Printer, USB, Wi-Fi.
Printer Troubleshooting
Printer problems are among the most common technology frustrations. Systematic troubleshooting approach: Printer won’t print: check it is powered on, connected (USB or same Wi-Fi network), and set as the default printer; restart both the printer and computer; check the print queue (Windows: Control Panel > Devices and Printers > right-click printer > See what’s printing) for stuck jobs; clear the print spooler (see Print Spooler entry). Poor print quality: run the printer’s built-in print head alignment and nozzle check (found in printer software or control panel); clean ink heads if clogged; check ink/toner levels; use correct paper type. Wireless printing not working: ensure printer and computer are on the same Wi-Fi network (not one on 2.4GHz and the other on 5GHz creating an apparent disconnect); reinstall printer driver; temporarily use USB to confirm printer works. Paper jams: always pull paper in the direction of paper travel (never back out); check for small torn pieces remaining; ensure correct paper size is loaded properly. Canon, Epson, HP, and Brother all offer printer diagnostic utilities on their websites. See also: Print Spooler, Driver, Printer, Print to PDF.
Privacy Act / Australian Privacy Principles
The Privacy Act 1988 (Cth) is Australia’s principal federal privacy legislation, governing how Australian Government agencies and private sector organisations with turnover over $3 million collect, use, store, and disclose personal information. It is regulated by the Office of the Australian Information Commissioner (OAIC). The Act includes 13 Australian Privacy Principles (APPs) covering: what information can be collected and how; how it must be stored securely; when it can be used or disclosed; how individuals can access and correct their own data; and cross-border data flow requirements. Significant reforms are underway (Privacy Act Review 2023) to align Australian privacy law more closely with GDPR and to introduce stronger data breach penalties. The help securing your business after a data breach (NDB) scheme requires organisations to report serious data breaches to the OAIC and affected individuals. See also: Data Breach, OAIC, Cybersecurity.
Private Browsing / Incognito Mode
Private Browsing (called Incognito in Chrome, Private Window in Firefox and Safari, InPrivate in Edge) is a browser mode that does not save your browsing history, cookies, form data, or cached files to your device after the session ends. This means the next person who uses the same browser cannot see what sites you visited. Important misconception: Private browsing does NOT make you anonymous online. Your ISP can still see your browsing activity, websites can still log your IP address, network administrators can still monitor traffic, and your employer can see what you do on a work network. For true privacy, a VPN (and ideally Tor) is needed in addition to private browsing. Private browsing is useful for: logging into accounts on shared computers, preventing personalised ads from tracking a session, and testing websites without cached data. See also: Browser, VPN, Cookie.
Productivity Suite / Office Software
A productivity suite is a collection of software applications designed for common office and business tasks – word processing, spreadsheets, presentations, email, and calendaring. The two dominant suites are: Microsoft 365 setup and support (formerly Office 365) – Word (word processing), Excel (spreadsheets), PowerPoint (presentations), Outlook (email and calendar), Teams (video conferencing and chat), and OneDrive (cloud storage); available via monthly subscription. Google Workspace (formerly G Suite) – Docs, Sheets, Slides, Gmail, Calendar, Meet, and Drive; subscription-based for business, free for personal use. Apple iWork – Pages, Numbers, Keynote – free on Apple devices. LibreOffice – free, open-source alternative compatible with Microsoft Office formats. See also: SaaS, Cloud Computing, PDF.
Programming Language
A programming language is a formal system of instructions that humans use to tell computers what to do. Rather than writing in binary (0s and 1s), developers write code in human-readable languages that are then converted (compiled or interpreted) into machine instructions. Major programming languages and their primary uses: Python – AI/ML, data science, automation, web backends (most popular overall in 2024); JavaScript – web development (front and back end); Java – enterprise applications, Android; C/C++ – operating systems, games, embedded systems; Swift – iOS and macOS apps; Kotlin – Android apps; Rust – systems programming, performance-critical applications; SQL – database queries; PHP – web backends (WordPress is PHP); TypeScript – typed JavaScript for large applications. See also: Open Source Software, IDE, Algorithm.
Project Management Software
Project management software helps teams plan, track, and collaborate on work. The market offers tools for every scale and style: Asana – task and project tracking with timeline views; popular for marketing and ops teams; Monday.com – highly visual, flexible, good for non-technical teams; Jira (Atlassian) – the standard for software development; deep Scrum/Agile support, bug tracking, and integration with code repositories; Trello (Atlassian) – simple Kanban boards; intuitive for small teams; Notion – combines wikis, databases, and project management in one flexible workspace; ClickUp – highly customisable, attempts to replace multiple tools; Microsoft Planner / Project – integrated with Microsoft 365; Basecamp – simple project collaboration with client portals. Choice depends on team size, technical complexity, and existing software ecosystem. See also: Agile / Scrum / Kanban, SaaS, Cloud Computing.
Projector
A projector is an output device that projects a large image from a computer, streaming device, or Blu-ray player onto a screen, wall, or flat surface. Used in meeting rooms, classrooms, home theatres, and events. Types: DLP (Digital Light Processing) – uses a chip with tiny mirrors; sharp image, good contrast; common in business projectors; LCD projector – uses liquid crystal panels; good colour accuracy; Laser projector – uses laser light source instead of a bulb; longer lifespan, brighter, no bulb replacement. Key specs: Lumens (brightness – higher is better for well-lit rooms); Resolution (1080p for general use, 4K for premium home theatre); Throw ratio (short throw projectors work in small rooms; ultra-short throw projects from just centimetres away). Connections: HDMI, USB-C. See also: HDMI, Monitor.
Prompt Engineering
Prompt engineering is the practice of crafting effective instructions (prompts) to guide AI language models toward AI productivity services. Because LLMs are highly sensitive to how questions and instructions are phrased, small changes in wording can dramatically affect result quality. Effective prompt techniques include: being specific (detailed instructions produce more targeted results); providing context (explaining who you are and why you need the output); role assignment (telling the model to act as a specific expert); few-shot prompting (providing 2–3 examples of the desired output format); chain-of-thought (asking the model to reason step-by-step before answering); and output formatting (specifying the structure – table, bullet points, JSON). Prompt engineering has become a valued business skill as organisations integrate AI tools into workflows. See also: Large Language Model (LLM), Generative AI, AI Chatbot.
Protocol
A protocol is a standardised set of rules that defines how data is formatted and transmitted between devices on a network, ensuring devices from different manufacturers can communicate. Without protocols, every device would “speak” a different language and interoperability would be impossible. The internet runs on hundreds of protocols; common ones include: TCP/IP (Transmission Control Protocol / Internet Protocol – the foundational protocol suite of the internet); HTTP/HTTPS (web browsing); DNS (domain name resolution); SMTP/IMAP/POP3 (email); FTP/SFTP (file transfer); SSH (secure remote terminal access); DHCP (automatic IP address assignment); VoIP/SIP (voice calls); MQTT (IoT device messaging). See also: HTTPS / SSL / TLS, DNS, Network, IP Addressing.
Proxy Server
A proxy server acts as an intermediary between your device and the internet. When you use a proxy, your requests are sent to the proxy server first, which then makes the request on your behalf and returns the result to you. Uses include: Privacy – hiding your real IP address from websites; Content filtering – businesses and schools use forward proxies to filter and log internet access; Caching – a proxy can cache frequently requested content to reduce bandwidth and improve load times; Bypassing geo-restrictions – accessing content not available in your country. Proxies differ from VPNs: proxies typically only redirect traffic from a specific application (like a browser), operate at a higher level, and usually don’t encrypt traffic. VPNs encrypt all network traffic at the system level. See also: VPN, Firewall, DNS.
PSU (Power Supply Unit)
A power supply unit converts AC mains power from the wall socket into the regulated DC voltages (12V, 5V, 3.3V) that computer components require. PSU capacity is rated in watts (W). A mainstream gaming PC typically requires 600–750W; a high-end system with multiple GPUs or storage drives may require 1000W or more; AI workstations with NVIDIA H100 GPUs may require 2000W+ per system. PSU quality is critical – a cheap, low-quality PSU can cause system instability, crashes, hardware damage, or fire risk. Look for PSUs with 80 PLUS efficiency ratings (Bronze, Gold, Platinum, Titanium) indicating energy efficiency. Modular PSUs only include the cables you need, reducing cable clutter. Always invest in a quality PSU from reputable brands like Seasonic, Corsair, EVGA, or be Quiet!. See also: Computer, GPU, UPS.
Quality of Service (QoS)
QoS refers to networking technologies that manage traffic prioritisation on a network to ensure reliable performance for time-sensitive applications. By assigning priority levels to different traffic types, a router or switch can ensure that a video call (which needs consistent, low-latency bandwidth) is not degraded by someone simultaneously downloading a large file on the same network. Common QoS applications: prioritising VoIP calls, video conferencing (Zoom, Teams), online gaming, and IPTV over background downloads, cloud backups, and software updates. QoS is configured in router settings and business-grade firewalls. See also: Router, Firewall, Latency, VoIP.
QR Code (Quick Response Code)
A QR code is a two-dimensional barcode that smartphones can scan to instantly access a URL, contact information, payment instructions, or other encoded data. QR codes can store far more information than a traditional barcode. They became mainstream in Australia during the COVID-19 pandemic for venue check-in contact tracing and have since been widely adopted for digital payments, restaurant menus, product information, event tickets, marketing campaigns, and linking print materials to online content. Beware of quishing (QR code phishing) – criminals post fake QR codes over legitimate ones (in car parks, on restaurant tables, on parking meters) that redirect to fraudulent websites. Always verify QR codes in public locations before proceeding. See also: NFC, Phishing.
Quantum Computing
Quantum computing harnesses quantum mechanics – specifically the principles of superposition (a qubit can be 0 and 1 simultaneously), entanglement (correlated qubits can influence each other instantly), and interference – to perform certain calculations exponentially faster than classical computers. Quantum computers excel at specific problem types: optimising complex logistics, simulating molecular interactions for drug discovery, solving certain cryptography problems, and modelling financial risk. They are not simply faster classical computers – they complement rather than replace traditional computing. As of 2025, quantum computers are in early commercial stages (IBM, Google Quantum AI, IonQ, Quantinuum). The most significant security implication: sufficiently powerful quantum computers could break current RSA and ECC encryption, driving the development of post-quantum cryptography standards. See also: Encryption, Artificial Intelligence, GPU.
RAG (Retrieval-Augmented Generation)
Retrieval-Augmented Generation is an AI architecture that combines a language model with a search or retrieval system, allowing the AI to access and reference external knowledge sources when generating responses rather than relying solely on what it learned during training. In a RAG system: when you ask a question, the system first searches a document database (using vector embeddings), retrieves the most relevant chunks of text, and provides them as context to the LLM, which then generates a response grounded in that retrieved information. This solves the problem of AI “hallucinating” facts – because the model is citing specific documents, responses are more accurate and verifiable. RAG is used in business AI and IT services that answer questions about company policies, legal databases, medical knowledge bases, and customer support systems. See also: Large Language Model (LLM), Embeddings, Hallucination (AI).
RAID (Redundant Array of Independent Disks)
RAID combines multiple physical hard drives or SSDs into one logical storage unit to improve performance, data redundancy, or both. Key RAID levels: RAID 0 (striping) – splits data across drives for speed, but zero redundancy; one drive failure destroys all data; RAID 1 (mirroring) – writes identical data to two drives; one can fail without data loss; RAID 5 – striping with distributed parity across ≥3 drives; balanced speed and redundancy; can survive one drive failure; RAID 6 – like RAID 5 but survives two simultaneous drive failures; RAID 10 – mirroring and striping combined; excellent performance and redundancy but requires twice the drives. RAID is common in NAS devices, servers, and professional workstations. Critical reminder: RAID is not a backup. It protects against drive failure but not against ransomware, accidental deletion, fire, or flood. See also: NAS, Cloud Backup, Hard Drive (HDD).
RAID Recovery
RAID recovery refers to recovering data from a RAID array that has failed beyond its fault-tolerance capacity. While RAID provides redundancy against single-drive failures (in RAID 1, 5, 6, and 10), it can still fail when: multiple drives fail simultaneously or in rapid succession; the RAID controller fails and configuration data is lost; an array is accidentally deleted or reconfigured; drives are connected in the wrong order after a rebuild; or the array experiences a critical error during rebuild. RAID recovery typically involves: imaging each member drive individually; using our RAID data recovery service to analyse the drives and determine the RAID parameters (level, block size, drive order, parity rotation); reconstructing the virtual array from the images; and then recovering data from the reconstructed volume. RAID 5 recovery is particularly complex because it requires all remaining drives and correct parity calculations. See also: RAID, NAS Recovery, Data Recovery, Disk Image.
Rainbow Table / Password Hashing
A rainbow table is a precomputed lookup table used to crack password hashes. When websites store passwords, they should never store the plain text – instead they store a hash (the output of running the password through a hash function). A rainbow table contains millions of pre-calculated hash values for common passwords, allowing attackers to look up a stolen hash and find the original password instantly. Salting is the defence: before hashing, a unique random value (the “salt”) is added to each password. This means even two users with the same password have different hashes, and precomputed rainbow tables become useless. Modern secure password hashing uses algorithms specifically designed to be slow (professional security services), making large-scale brute-force attacks computationally expensive even if the database is stolen. See also: Checksum / Hash Function, Encryption, Password Manager, Data Breach.
RAM (Random Access Memory)
RAM is the temporary working memory your computer uses for currently running programs and open files. Unlike storage (SSD/HDD) which retains data when powered off, RAM is volatile – it loses all content when the computer is switched off. If the SSD is the filing cabinet, RAM is the desk where active work is spread out. Insufficient RAM causes slowdowns as the system uses the SSD as “virtual memory” (much slower). Modern requirements: 8GB is minimum for basic Windows use; 16GB is recommended for most users; 32GB–64GB for video editing, 3D work, programming, running local AI models, or heavy multitasking. RAM speed (MHz or MT/s) matters mainly for AMD Ryzen and Intel systems with integrated graphics. DDR5 is the current standard in new systems, offering higher speeds than DDR4. See also: CPU, SSD, Virtual Memory.
Ransomware
Ransomware is malware that encrypts the victim’s files or locks them out of their system, then demands a ransom payment (usually in cryptocurrency) for the decryption key. Ransomware attacks have devastated hospitals, councils, schools, businesses, and government agencies globally, sometimes causing hundreds of millions of dollars in damage. The 2022 Medibank and Optus incidents demonstrated that even large organisations are vulnerable. Entry vectors include: phishing emails with malicious attachments, exposed Remote Desktop Protocol (RDP) services, unpatched vulnerabilities, and compromised third-party software supply chains. The best defences: offline and virus and ransomware removal services (ransomware typically cannot encrypt offline backups), MFA on all remote access, patching systems promptly, network segmentation, and staff cybersecurity awareness training. The ACSC advises against paying ransoms. See also: Malware, Cloud Backup, Cybersecurity, Phishing, Zero Trust Security.
Ransomware Recovery
Ransomware recovery is the process of restoring access to data encrypted or otherwise made inaccessible by a ransomware attack. Recovery options, in order of preference: Restore from clean backup – the gold standard; restore from a backup that predates the infection (professional data recovery service, offline backup, or backup on a network share not accessible to the ransomware); Use a decryption tool – law enforcement agencies and cybersecurity firms sometimes obtain and publish decryption keys for specific ransomware variants; the No More Ransom project (nomoreransom.org) is the first place to check; Restore from shadow copies / Volume Shadow Copy – if the ransomware did not delete Shadow Copies (many modern variants do); Pay the ransom – the option of last resort and not recommended by law enforcement; payment does not guarantee decryption and funds criminal operations. Rebuilding from scratch is sometimes the only option. See also: Ransomware, Cloud Backup, Shadow Copy, Data Recovery.
RAW Image Format
A RAW file is an image file that contains minimally processed data directly from a digital camera’s image sensor – essentially the raw captured data before any in-camera processing is applied. Unlike JPEG (which the camera processes and compresses immediately), a RAW file preserves all captured image data, giving photographers complete control in post-processing software (Adobe Lightroom, Capture One, Darktable). RAW advantages: superior dynamic range recovery, full white balance adjustment without quality loss, better noise reduction, higher colour depth (12–14 bit vs 8 bit for JPEG). RAW disadvantages: much larger file sizes (20–80MB per image vs 5–10MB for JPEG); requires post-processing before printing or sharing; and requires compatible software. Different camera brands have proprietary RAW formats: Canon uses .CR3, Nikon uses .NEF, Sony uses .ARW. See also: Lossless vs Lossy Compression, File Extension, Cloud Backup.
Ray Tracing
Ray tracing is a rendering technique that simulates the physical behaviour of light – tracing the path of millions of light rays as they bounce, reflect, refract, and absorb through a 3D scene to produce highly realistic shadows, reflections, global illumination, and ambient occlusion. Unlike traditional rasterization (which approximates lighting), ray tracing produces photorealistic results. Real-time ray tracing in games was enabled by NVIDIA’s RTX 20-series GPUs (2018), which include dedicated RT cores for hardware-accelerated ray tracing. DLSS (Deep Learning Super Sampling) from NVIDIA and FSR (FidelityFX Super Resolution) from AMD use AI upscaling to recover performance lost to ray tracing’s high computational cost. Ray tracing is also used for offline rendering in film VFX and 3D animation. See also: GPU, Artificial Intelligence, 4K / 8K Resolution.
RDP (Remote Desktop Protocol)
RDP (Remote Desktop Protocol) is Microsoft’s proprietary protocol for remote desktop connections – the underlying technology that powers Windows Remote Desktop. When you connect to a remote computer via Remote Desktop Connection (mstsc.exe), you’re using RDP. Key details: Port 3389 is the default RDP port; this port is constantly scanned and attacked by automated bots worldwide; exposed RDP is one of the top entry vectors for ransomware attacks. Security hardening: professional remote desktop support; always require VPN access first; enable Network Level Authentication (NLA); use strong passwords and MFA; consider changing the default port (security through obscurity but reduces automated scanning). RDP vs TeamViewer/AnyDesk: RDP requires a direct network connection (or VPN); third-party tools work through NAT and firewalls via their cloud relay. For businesses accessing office computers from home, RDP through a VPN is the secure approach. See also: Remote Desktop, VPN, Port Forwarding, Ransomware.
Recovery Mode
Recovery Mode is a special bootable environment on smartphones, tablets, and computers that operates independently of the main operating system. It is used to perform maintenance tasks that cannot be done while the OS is running: professional computer repair and recoveryting a device that won’t boot normally; installing OTA system updates; wiping the cache partition; flashing a new operating system (on Android); and recovering a device from a software failure. On iPhones, Recovery Mode (hold appropriate buttons during restart) allows iTunes/Finder to restore or update iOS. On Android, Recovery Mode is accessed by holding Power + Volume combinations and allows factory reset and cache wiping. On Windows, Recovery Mode (Windows Recovery Environment) allows startup repair, system restore, and command-line tools. See also: Factory Reset, Safe Mode, System Restore.
Recycle Bin / Trash
The Recycle Bin (Windows) or Trash (Mac) is a temporary holding area for deleted files. When you delete a file by pressing the Delete key or selecting “Delete,” it moves to the Recycle Bin rather than being immediately removed from the storage drive. This gives you an opportunity to recover accidentally deleted files. To permanently delete files, you must then “Empty Recycle Bin” (right-click the Recycle Bin icon). Files can be restored by opening the Recycle Bin and selecting “Restore.” Note: files deleted from removable storage (USB drives, SD cards) are typically permanently deleted immediately, bypassing the Recycle Bin. Very large files may also bypass the Recycle Bin and be permanently deleted immediately. See also: Data Recovery, File and Folder, Shadow Copy / Previous Versions.
Refresh Rate
Refresh rate measures how many times per second a monitor redraws the image displayed on screen, measured in Hertz (Hz). A 60Hz monitor updates 60 times per second; a 144Hz monitor 144 times per second. Higher refresh rates produce visibly smoother motion in fast-paced gaming, rapid cursor movement, and scrolling. For everyday computing, 60Hz is adequate. For gaming, 144Hz is the current mainstream standard; competitive players use 240Hz or 360Hz displays. Variable Refresh Rate (VRR) technologies synchronise the monitor refresh rate to the GPU’s actual frame output, eliminating tearing and stuttering. NVIDIA G-Sync and AMD FreeSync (which also works on NVIDIA cards) are the two main VRR standards. See also: GPU, Monitor, LCD.
Refurbished / Second-Hand Computers
Refurbished computers are previously owned devices that have been returned, inspected, repaired to working condition, cleaned, and resold – typically at 30–60% below the original retail price. Sources of refurbishment: manufacturer refurb programs (Apple Certified Refurbished, Dell Outlet, Lenovo Outlet) offer the highest quality with original warranties; third-party refurbishers (IT asset disposal companies, specialist retailers); and individual sellers (Gumtree, Facebook Marketplace). Grades: Grade A (like new, minimal cosmetic wear); Grade B (moderate cosmetic wear, fully functional); Grade C (visible cosmetic damage, functional). Key checks when buying second-hand: verify the device isn’t iCloud/Activation Locked (Apple) or enrolled in corporate MDM; check battery health (Mac: About This Mac > System Report > Power; Windows: run powercfg /batteryreport); test all ports, keyboard, and screen; and ensure the OS is genuine. For businesses, buying new and refurbished computer supply and setup with warranty is an excellent way to reduce IT hardware costs. See also: Laptop Buying Guide, E-Waste, Computer, Activation Lock.
Regular Expression (Regex)
A regular expression (regex or regexp) is a sequence of characters that defines a search pattern, used to find, match, or manipulate text in powerful ways. Regex is supported by virtually every programming language and many text editors and command-line tools. Examples of what regex can do: find all email addresses in a document; validate that a phone number has the correct format; extract all URLs from a web page; replace specific patterns of text across thousands of files. Regex syntax uses special characters: . matches any character; * means zero or more; + means one or more; [0-9] matches any digit. While powerful, regex can be notoriously difficult to read – even experienced developers regularly use online regex testers. See also: Algorithm, Programming Language.
Remote Desktop
Remote Desktop technology allows a user to view and control another computer over a network connection as if sitting directly in front of it – seeing the remote screen, using its mouse and keyboard, and running its applications. Uses include: professional remote computer support (technicians can diagnose and fix issues on a client’s computer remotely without an on-site visit); working from home (accessing your work PC from home); server management (system administrators managing headless servers). Common remote desktop tools include: Windows Remote Desktop Protocol (RDP) – built into Windows; our secure remote desktop support service; AnyDesk; Splashtop; and LogMeIn. Security note: exposed RDP on the internet (port 3389) is a major attack vector for ransomware and should never be publicly accessible without a VPN. See also: VPN, Managed IT Services, Cybersecurity.
Remote Work Technology
Remote work (also called working from home, WFH, or telecommuting) relies on a collection of technologies enabling employees to work effectively outside the traditional office: Video conferencing (Zoom, Teams, Google Meet); Collaboration platforms (Microsoft Teams, Slack – integrating chat, files, and video); Cloud productivity suites (Microsoft 365, Google Workspace – enabling document co-editing from anywhere); VPN (secure access to company systems and internal resources); Remote desktop (accessing your work PC from home); Project management tools (Asana, Monday.com, Jira, Trello); Cloud file storage (SharePoint, Google Drive, Dropbox); and reliable NBN or 5G internet. The COVID-19 pandemic dramatically accelerated remote work adoption and remote desktop support service. See also: VPN, Video Conferencing, Cloud Computing, NBN.
Responsible AI / AI Ethics
Responsible AI refers to the principles and practices guiding the development, deployment, and use of artificial intelligence in ways that are ethical, transparent, fair, and accountable. Key principles adopted by major organisations and governments: Fairness – AI systems should not discriminate based on protected characteristics (race, gender, age, disability); algorithmic bias occurs when training data reflects historical inequalities. Transparency / Explainability – AI decisions should be explainable, particularly in high-stakes contexts (credit decisions, medical diagnosis, criminal justice). Privacy – AI systems should minimise collection and use of personal data. Security – AI systems must be robust against adversarial attacks and misuse. Human oversight – humans should remain in control of high-stakes AI decisions. Accountability – clear responsibility for AI outcomes. Australia’s AI Ethics Framework (released by the Australian Government in 2019) and the EU AI Act (2024, the world’s first comprehensive AI regulation) establish frameworks for responsible AI. For businesses using AI: document AI use in customer-facing decisions; provide opt-outs where appropriate; test for bias. See also: AI Safety, Artificial Intelligence, Privacy Act.
Restart vs Shut Down vs Sleep vs Hibernate
These four power states behave differently and matter for performance and energy use: Shut Down – completely powers off the computer; RAM is cleared; all programs close; next startup is a full boot. Windows 10/11’s default “Shut Down” actually uses Fast Startup (a partial hibernate), so a full restart is sometimes needed to fully clear the system. Restart – performs a complete shut down and fresh reboot; clears RAM and temp files; recommended when troubleshooting or after installing updates. Sleep – saves current state to RAM, cuts power to most components; fast to resume (seconds) but uses a small amount of power; suitable for short breaks. Hibernate – saves current state to the hard drive and fully powers off; no power consumption; slower to resume than sleep; good for laptops when travelling. See also: Boot / Startup, Operating System, RAM.
Ripping
Ripping is the process of copying digital content from a physical disc (CD, DVD, or Blu-ray) to your computer’s hard drive or SSD. The term comes from the idea of “ripping” data off the disc. Ripped content remains on the original disc. Audio ripping extracts music tracks from CDs as MP3, FLAC, or AAC files. Video ripping extracts movie content for personal playback. In Australia, ripping media you own for personal backup use is generally considered lawful under fair dealing provisions, though the legal position has some nuance. See also: Blu-ray, Cloud Backup, DRM.
RMM (Remote Monitoring and Management)
Remote Monitoring and Management (RMM) is a platform used by Managed Service Providers (MSPs) to remotely monitor, manage, and maintain client IT systems. RMM software agents are installed on client computers, servers, and network devices, continuously reporting status back to the MSP’s dashboard. Capabilities: Real-time monitoring – CPU, RAM, disk usage, temperature, network connectivity, service status; Alert-based response – automated alerts when thresholds are exceeded or services fail; Patch management – automated deployment of Windows and third-party software updates; Remote access – technicians can connect to and troubleshoot any managed device remotely; Antivirus management – centralised security monitoring and response; Asset inventory – complete hardware and software inventory. Popular RMM platforms: ConnectWise Automate, Kaseya VSA, NinjaRMM, Datto RMM. RMM is what enables MSPs to proactively detect and fix issues before they cause downtime. See also: Managed IT Services, Patch Management, Remote Desktop.
Robot Vacuum / Smart Cleaning Appliances
Robot vacuums are autonomous vacuum cleaners that navigate a home automatically, cleaning floors without manual operation. Modern premium models (Roborock, Dreame, iRobot Roomba, Ecovacs) include: LiDAR mapping – laser scanning creates a precise map of your home; Smart navigation – systematically covers the entire floor (not just random bouncing); App control – schedule cleaning, define no-go zones, view cleaning maps on smartphone; Auto-empty base stations – empties the dustbin automatically into a larger bag; Mop combination – many now include mopping functionality with water tanks. Robot vacuums work best on hard floors (tiles, timber, vinyl) and low-pile carpet. They struggle with: high-pile shag carpet; cables on the floor (major tangle hazard); small objects like socks; and very dark floors (some navigation systems are confused by black surfaces). Budget models ($150–300) use random navigation; quality models with LiDAR mapping start around $500–700 AUD. See also: Smart Home, IoT, Wi-Fi.
Romance Scam / Catfishing
A romance scam is a type of fraud where a criminal creates a fake online persona – typically on dating apps (Tinder, Bumble, Hinge), Facebook, Instagram, or WhatsApp – to develop a fake romantic relationship with a victim over weeks or months, then requests money. Common fake personas: military personnel deployed overseas, oil rig workers, doctors working with international organisations, successful business people travelling abroad. After establishing trust, the scammer invents a crisis – medical emergency, stuck abroad, business opportunity, customs problem – and requests money via wire transfer, gift cards, or cryptocurrency. The “pig butchering” variant combines romance with fake investment: the “partner” gradually convinces the victim to invest in a fake cryptocurrency platform, which initially shows profits, then demands more money to “withdraw,” ultimately disappearing with everything. Australian losses to romance scams exceed $30 million annually. If you are concerned someone you met online is a scammer, reverse image search their photos (Google Images, TinEye). See also: Online Scam Types, Investment Scam, Scamwatch.
Rooting / Jailbreaking
Rooting (Android) and jailbreaking (iPhone/iPad) are processes that remove the manufacturer’s and operating system’s security restrictions, granting the user full administrative (“root”) access to the device’s operating system. This allows installing apps from outside official stores, accessing system files, removing pre-installed bloatware, applying deep customisations, and enabling features the manufacturer blocks. Risks include: voiding warranty; professional virus removal and security service (security sandboxes are removed); breaking system stability; making the device unable to receive OTA updates; and being detected by banking apps, mobile payment apps, and enterprise MDM systems that refuse to work on rooted/jailbroken devices. In Australia, rooting your own device for personal use is generally legal, but bypassing DRM is more legally complex. See also: DRM, MDM, OS.
Router
A router is a networking device that manages and directs data traffic between your local network and the internet, and between devices within your local network. Modern home routers combine several functions in one device: modem interface (connecting to NBN/internet), router (managing traffic routing), switch (providing multiple wired Ethernet ports), and wireless access point (broadcasting Wi-Fi). Key router features to look for: Wi-Fi 6 or 6E/7 support; gigabit or 2.5 Gbps Ethernet ports; robust firewall and security features; Quality of Service (QoS) settings; VPN server capability; and parental controls. Business-grade firewall/routers (professional network and router setup, Cisco Meraki, Ubiquiti) add enterprise security features. troubleshoot your Wi-Fi and router issues is one of the most important and overlooked home security practices. See also: Firewall, Wi-Fi 6 / 6E / 7, Mesh Network, VPN, Network Switch.
RPO and RTO (Recovery Point Objective / Recovery Time Objective)
Two critical metrics for business disaster recovery planning: RPO (Recovery Point Objective) defines the maximum age of data that an organisation can afford to lose – essentially, how far back you can afford to roll back. An RPO of 4 hours means backups must run at least every 4 hours; an RPO of 24 hours means daily backups suffice; an RPO of zero requires real-time continuous replication. RTO (Recovery Time Objective) defines the maximum time allowed to restore systems and data after an outage – how quickly you need to be operational again. A business-critical system might have an RTO of 1 hour; a less critical system might allow 48 hours. Shorter RPO and RTO require more sophisticated (and expensive) backup and disaster recovery solutions. Understanding your organisation’s RPO and RTO requirements should drive your backup strategy choices. See also: Backup vs Data Recovery, Cloud Backup, Disaster Recovery.
SaaS / PaaS / IaaS (Cloud Service Models)
Three layers of cloud service delivery: SaaS (Software as a Service) – fully managed software delivered over the internet with no local installation. Examples: business IT support services, Google Workspace, Xero, MYOB, Salesforce, Canva, Dropbox, Adobe Creative Cloud. PaaS (Platform as a Service) – a managed cloud platform providing developers with tools, frameworks, databases, and infrastructure to build and deploy applications without managing the underlying hardware or OS. Examples: Heroku, Google App Engine, Azure App Service. IaaS (Infrastructure as a Service) – raw computing infrastructure (virtual machines, storage, networking) rented on-demand. Examples: Amazon Web Services (AWS), Microsoft Azure, Google Cloud Platform. Most businesses now rely on a mix of SaaS applications for day-to-day operations. See also: Cloud Computing, API, Virtualisation.
SaaS Security / Shadow IT
SaaS Security refers to the security considerations specific to using cloud-based software services. Key concerns: Data location and sovereignty – where does the SaaS store your data? Is it in Australia? Subject to foreign governments’ data access laws? Access control – who in your organisation has admin access to each SaaS tool? Are ex-employees’ accounts deactivated? Single Sign-On integration – using SSO reduces the attack surface (one identity to protect rather than many). API security – SaaS integrations via API keys can be a breach vector if keys are exposed. Shadow IT is the use of software, services, and applications by employees without IT department knowledge or approval – employees signing up to Dropbox, Trello, ChatGPT, or other tools with their work email to solve immediate problems. business IT security and SaaS governance: data governance risks (sensitive data in unauthorised locations); security gaps (no IT oversight of access controls); compliance risks; and data loss risks (if the employee leaves or the service changes). Organisations should have clear acceptable use policies and make approved alternatives available. See also: SaaS, Zero Trust Security, IAM, Data Sovereignty.
Safe Mode
Safe Mode is a diagnostic startup mode available in Windows, Android, and macOS that loads the operating system with only the most essential drivers and services active – all third-party software, non-essential drivers, and startup programs are disabled. Safe Mode is used to diagnose and fix problems that cannot be resolved in normal mode: professional virus and malware removal that prevents itself from being deleted during normal operation; diagnosing whether a crash or slowdown is caused by a third-party app or driver; fixing display driver problems; and uninstalling problematic software. In Windows, access Safe Mode by holding Shift and clicking Restart, then navigating Troubleshoot > Advanced options > Startup Settings. On Android, hold the power button and long-press “Power off.” See also: Boot, Driver, Malware, Crash.
Satellite Internet – See Starlink
Traditional geostationary satellite internet (like NBN Sky Muster) requires signals to travel roughly 35,000km up to a satellite and back, resulting in high latency. For the latest generation of low-earth orbit satellite internet, see Starlink. See also: NBN, Starlink, Latency.
Scamwatch / Reporting Scams in Australia
Scamwatch (scamwatch.gov.au) is the Australian Competition and Consumer Commission (ACCC)’s dedicated scam reporting and awareness website. It is the primary place to: report scams you have encountered; check whether a contact, website, or offer is a known scam; learn about the latest scam types targeting Australians; and find guidance on what to do if you’ve been scammed. Scamwatch publishes annual scam loss data – Australians reported losses of over $2.74 billion to scams in 2023. Other reporting channels: ReportCyber (cyber.gov.au) – for cybercrime including hacking, ransomware, and unauthorised access; ACSC – Australian Cyber Security Centre for cybersecurity incidents; AFCA (Australian Financial Complaints Authority) – for financial scam disputes with banks or financial services; ACMA – for spam SMS and phone number spoofing. If you have provided financial information or transferred money to a scammer, contact your bank immediately. Report identity theft to IDCARE (idcare.org, 1800 595 160) – Australia and New Zealand’s national identity and cyber support service. See also: Online Scam Types, Phishing, Tech Support Scam, Identity Theft.
Scanner (Document / Flatbed Scanner)
A scanner is an input device that digitises physical documents, photos, books, and objects into digital image files by passing a light source and sensor array across the original. Types: Flatbed scanner – the original lies flat on a glass bed; most accurate for photos and bound documents; Sheetfed scanner – documents are fed through automatically; ideal for high-volume document scanning; Portable/handheld scanner – dragged across a page; less accurate but portable; Film scanner – digitises photographic negatives and slides. Key specifications: resolution (DPI – 600 DPI for documents, 1200+ DPI for photos, 4800+ DPI for film); colour depth; scan speed; and software (most include scanner setup and configuration service – Optical Character Recognition – to convert scanned text into editable text). See also: All-in-One Printer, OCR, USB.
Screen Lock Types and Security Levels
The security of your phone’s lock screen depends heavily on the type of authentication used, from weakest to strongest: No lock / Swipe – anyone with physical access can use the phone immediately; provides no security; never use. Pattern – traces a pattern on a grid; can often be determined by oil smudge marks on the screen; limited number of patterns means it can be brute-forced; medium security. 4-digit PIN – 10,000 combinations; can be observed; automated cracking tools exist; low security for sensitive use. 6-digit PIN – 1,000,000 combinations; significantly better. Alphanumeric passcode / Password – strongest PIN option; near impossible to brute force if sufficiently long and complex. Fingerprint – fast, convenient, and secure; cannot be observed; can be defeated by a good silicone copy of your fingerprint; mobile security advice in some jurisdictions. Face ID (iPhone) – 1 in 1,000,000 false acceptance rate; cannot be spoofed by photos; most secure biometric for most users. See also: Biometrics, Multi-Factor Authentication (MFA), Phone Security Checklist.
Screen Reader / Text-to-Speech
A screen reader is assistive technology software that interprets and reads aloud the text, labels, and descriptions of on-screen content to users who are blind or have low vision. Screen readers also translate visual information into Braille output for refreshable Braille displays. Built-in screen readers: VoiceOver (Apple – available on Mac, iPhone, iPad, Apple Watch, Apple TV); Narrator (Windows); TalkBack (Android). Third-party: JAWS (Job Access With Speech) and NVDA (NonVisual Desktop Access) are widely used on Windows. Text-to-Speech (TTS) is the broader technology that converts text to spoken audio – used in navigation apps, ebooks, learning tools, and AI assistants. Speech-to-Text (STT) is the reverse – converting spoken words to text, used in transcription, voice assistants, and dictation. See also: Accessibility Features, Voice Assistant.
Screen Resolution Guide
Understanding screen resolution and density helps when buying monitors, TVs, and devices. Common resolutions: HD (720p) – 1280×720; minimum for modern streaming; suitable for small displays under 24″. Full HD / 1080p – 1920×1080; the standard for computer monitors and most TVs; excellent for displays up to 27″. 2K / QHD / 1440p – 2560×1440; noticeably sharper than 1080p on monitors 27–32″; popular for gaming and productivity. 4K / UHD – 3840×2160; extraordinary detail on 27″+ monitors; standard for new TVs; excellent for creative work and future-proofing. 5K – 5120×2880; Apple Studio Display and Pro Display XDR. 8K – 7680×4320; limited content; mostly in very large TVs. Pixel density (PPI) – pixels per inch; Apple’s Retina threshold (~220 PPI for typical viewing distance) is where individual pixels become invisible; a 4K 27″ monitor at ~163 PPI is not technically Retina but still very sharp. Key rule: higher resolution matters more at closer viewing distances and larger sizes. See also: Pixel, Monitor, 4K / 8K Resolution.
Screen Time / Digital Wellbeing
Screen Time (Apple) and Digital Wellbeing (Android) are built-in tools that track how much time you spend on your device and in specific apps, and allow you to set usage limits. Features include: daily usage reports showing total screen time and per-app breakdown; app time limits (e.g., maximum 30 minutes of social media per day); downtime scheduling (blocking all apps except selected ones during set hours); communication limits; and content restrictions for children’s devices. Research shows excessive screen time – particularly on social media – is associated with reduced sleep quality, anxiety, and reduced attention spans, particularly in young people. Australia is the first country to have banned parental controls and device security setup. See also: Parental Controls, Notification, App.
Screenshot / Screen Capture
A screenshot captures an image of whatever is currently displayed on your screen, saved as a picture file. This is incredibly useful for: sharing error messages with IT support; capturing information from websites; documenting steps in a process; and recording evidence of scams or issues. Windows methods: PrtScr – copies the whole screen to clipboard; Win+PrtScr – saves a screenshot to Pictures > Screenshots; Win+Shift+S (Snipping Tool) – lets you select any area of the screen; Alt+PrtScr – captures only the active window. Mac: Cmd+Shift+3 – full screen; Cmd+Shift+4 – selected area; Cmd+Shift+5 – full tool. On smartphones, press Power + Volume Down (Android) or Power + Volume Up (iPhone, no Home button) simultaneously. See also: Keyboard Shortcuts, File and Folder.
Scroll / Scrollbar
Scrolling moves the view of a document, webpage, or list up, down, left, or right to see content that doesn’t fit on the visible screen. Methods: Scroll wheel on a mouse – rotate the wheel forward/backward; Touchpad – slide two fingers up or down; Touchscreen – swipe with a finger; Keyboard – arrow keys, Page Up/Down, Home (go to top), End (go to bottom); Scrollbar – the thin bar on the right (and sometimes bottom) edge of a window that you can click and drag. Scroll speed can be adjusted in mouse settings. See also: Mouse, Touchpad / Trackpad, Touchscreen.
SD Card / Memory Card
An SD (Secure Digital) card is a small, removable flash memory card used to store data in cameras, smartphones, drones, dashcams, handheld gaming devices, and single-board computers (like Raspberry Pi). SD cards come in three physical sizes: full-size SD (cameras), miniSD (largely obsolete), and microSD (smartphones, action cameras, drones). Speed classes (Class 2/4/6/10, UHS-I/II/III, V30/V60/V90) indicate minimum write speeds important for video recording – a V30 card can record at minimum 30 MB/s, necessary for 4K video. Storage capacities range from 2GB to 2TB (SDXC format). SD card slots are found in fewer laptops each year, with USB card readers used instead. See also: USB, SSD, Cloud Backup.
SD-WAN (Software-Defined Wide Area Network)
SD-WAN is a technology that uses software to intelligently manage and optimise the routing of network traffic across multiple WAN connections (NBN, 4G/5G, MPLS, Starlink) based on real-time performance conditions, application requirements, and business policies. Rather than fixed static routes, SD-WAN dynamically chooses the best path for each type of traffic. For example: video calls might always be routed via the lowest-latency link; large file backups might be sent via the cheapest connection; and critical business applications might use dedicated links with failover to 4G if the primary connection fails. SD-WAN is widely deployed by enterprises with multiple office locations or remote workers. Benefits include: reduced WAN costs (using professional network setup and SD-WAN); improved application performance; centralised management; and automatic failover. See also: Router, Firewall, NBN, Latency.
Search Engine
A search engine is a website that searches the internet for pages, images, videos, and other content matching the words or questions you type, then displays the results ranked by relevance. The dominant search engine is Google (handling over 90% of global searches). Others include Microsoft Bing, Yahoo, DuckDuckGo (privacy-focused, doesn’t track your searches), and Brave Search. To get the best results: use specific keywords rather than full sentences for simple searches; use quotation marks to search for an exact phrase (“The Original PC Doctor”); add “Australia” to get locally relevant results; and use search operators like site:thepcdoctor.com.au to search within a specific website. See also: Browser, Homepage.
SEO (Search Engine Optimisation)
Search Engine Optimisation is the practice of improving a website’s visibility in organic (unpaid) search engine results – primarily Google. When someone searches for “computer repairs Melbourne,” website and IT services of results without paying for an ad is the goal of SEO. Key SEO elements: On-page SEO – optimising content quality, keywords, title tags, meta descriptions, headers, and page structure; Technical SEO – site speed (Core Web Vitals), mobile-friendliness, HTTPS, site architecture, and structured data markup; Off-page SEO – building backlinks (other reputable sites linking to yours); Local SEO – optimising Google Business Profile and local citations for location-based searches; Content SEO – creating comprehensive, authoritative content that answers user questions. Google’s algorithm considers hundreds of signals. AI-generated content is increasingly common but quality and expertise (EEAT) remain what Google rewards. See also: Web Hosting, Domain Name, HTML / CSS / JavaScript.
Server
A server is a computer or software system that provides services, resources, or data to other computers (called clients) over a network. While any computer can technically act as a server, dedicated server hardware is designed for continuous operation (24/7/365), high reliability, redundant components, and hot-swappable parts. Types of servers: Web server – hosts websites and web applications (Apache, Nginx); File server – stores and shares files across a network; Email server – manages sending and receiving email (Microsoft Exchange, Postfix); Database server – stores and queries databases (MySQL, PostgreSQL, SQL Server); Domain controller – manages user authentication and network access (Microsoft Active Directory); Application server – runs business applications; Game server – hosts multiplayer game sessions. Physical servers have largely been replaced by virtual machines (VMs) and cloud instances. See also: Cloud Computing, Virtualisation, NAS, Linux.
Serverless Computing
Serverless computing (also called Functions as a Service, or FaaS) is a cloud execution model where you write and deploy individual functions of code without managing any server infrastructure. The cloud provider automatically allocates resources, scales to demand, and charges only for actual execution time (measured in milliseconds) rather than for continuously running servers. cloud and IT services for business, Google Cloud Functions, and Azure Functions are the major serverless platforms. A serverless function might: resize an image when uploaded; send a notification email when an order is placed; process a webhook; or respond to an API request. Despite the name, servers still exist – “serverless” means you don’t think about, provision, or manage them. See also: Cloud Computing, SaaS / PaaS / IaaS, API.
Shadow Copy / Previous Versions / Volume Shadow Copy Service (VSS)
Windows Volume Shadow Copy Service (VSS) automatically creates point-in-time snapshots (shadow copies) of files and volumes while the system is running, without interrupting work. Shadow copies are stored on the same drive. They can be accessed via: Previous Versions – right-click a file or folder > Properties > Previous Versions tab; shows available restore points for that file; File History – a Windows backup feature using shadow copies; System Restore – uses VSS to revert the system to a previous state. Shadow copies are extremely useful for recovering accidentally deleted or overwritten files without needing a separate backup. However, they are our data recovery service – ransomware often specifically deletes shadow copies, and drive failure destroys shadow copies along with the main data. See also: Data Recovery, Cloud Backup, Ransomware Recovery.
SharePoint
SharePoint is Microsoft’s web-based document management and collaboration platform, included with Microsoft 365. It serves as the backend document storage for Teams (every Teams channel has a corresponding SharePoint document library). Key uses: Intranet – internal company websites for news, policies, procedures, and announcements; Document libraries – centralised storage with version history, co-authoring, and permissions management; Lists – structured data tracking (similar to a simple database or spreadsheet shared across a team); Project sites – dedicated spaces for projects with associated files, tasks, and conversations. SharePoint’s permissions model is powerful but complex – controlling who can access which documents and sites is an important governance task for IT administrators. SharePoint Online (the cloud version in Microsoft 365) is significantly easier to manage than on-premises SharePoint Server. See also: Microsoft 365, Teams Collaboration, Cloud Computing, File Permissions.
Shortcut (Desktop Shortcut)
A desktop shortcut is a small file that acts as a link to a program, file, folder, or website – when double-clicked, it opens the target item. Shortcuts are identifiable by the small arrow overlay on their icon. Importantly, a shortcut is not the actual program or file – it is just a pointer. Deleting a shortcut does not delete the actual program or file it points to. You can create a shortcut by right-clicking a program or file and selecting “Create shortcut” or “Pin to taskbar/Start.” If a shortcut stops working (the target has been moved or deleted), Windows shows an error. See also: Icon, Desktop (UI), Taskbar.
SIEM (Security Information and Event Management)
A SIEM system collects, aggregates, and analyses log data from across an organisation’s IT infrastructure – servers, firewalls, endpoints, applications, and cloud services – in real time, to detect security threats and compliance violations. SIEM correlates events across multiple systems to spot patterns that would be invisible when looking at any single system in isolation: for example, detecting that a user account failed login 50 times across multiple servers (brute force attack) followed by a successful login (account compromise). Leading SIEM platforms include Splunk, Microsoft Sentinel, IBM QRadar, and Elastic SIEM. SIEM is a core tool for Security Operations Centres (SOCs). For most small-medium businesses, a managed IT services is more practical than an in-house deployment. See also: Firewall, IDS / IPS, Cybersecurity, Managed IT Services.
SIM Card (Subscriber Identity Module)
A SIM card is a small removable chip inserted into a mobile phone or cellular device that identifies you to your carrier’s network, stores your phone number, and authenticates your account. SIM cards come in three physical sizes: Standard SIM (25mm × 15mm, now rare); Micro SIM (15mm × 12mm); and Nano SIM (12.3mm × 8.8mm, used by most modern phones). A SIM card stores your IMSI (International Mobile Subscriber Identity) which the carrier uses to identify you. SIM swapping is a serious fraud where criminals convince a carrier to transfer your phone number to a SIM card they control – intercepting your SMS messages and two-factor authentication codes. Always use an authenticator app rather than SMS for MFA to protect against protect yourself from SIM swap and phone scams. See also: eSIM, IMEI, Multi-Factor Authentication.
SIM Swapping Attack
A SIM swap (or SIM hijacking) attack is a form of identity theft where a criminal convinces your mobile carrier (Telstra, Optus, Vodafone, or an MVNO) to transfer your phone number to a SIM card the criminal controls – by impersonating you using personal information obtained through data breaches, social engineering, or purchased from data brokers. Once they control your number, every SMS message sent to your number (including SMS-based two-factor authentication codes) goes to the attacker, not you. With access to your SMS codes, attackers can reset passwords and take over your email, banking, social media, and cryptocurrency accounts within minutes. Warning signs: your phone suddenly loses signal while others have coverage (you’ve been SIM swapped); you stop receiving calls and texts. Immediate action: call your carrier immediately; contact your bank. Prevention: use authenticator app-based 2FA instead of SMS; add a phone account PIN/passcode with your carrier; use a Google Voice number for SMS 2FA instead of your real mobile number. See also: SIM Card, Multi-Factor Authentication (MFA), Social Engineering, Data Breach.
SSO (Single Sign-On)
Single Sign-On is an authentication method that allows users to log in once with one set of credentials and gain access to multiple applications without logging in again. In an SSO system, a centralised Identity Provider (IdP) (such as Microsoft Entra ID, Okta, Google Workspace, or Ping Identity) authenticates the user and issues tokens that other applications (Service Providers) trust. Example: an employee logs into their computer with their company credentials, and automatically has access to Salesforce, Slack, GitHub, Google Workspace, and dozens of other SaaS tools – without entering a password for each. Benefits: improved user experience (one password to remember); stronger security (one strong password + MFA instead of weak passwords across many apps); business IT and SSO setup (remove access to all apps by disabling one account when staff leave). SSO uses protocols such as SAML 2.0, OAuth 2.0, and OpenID Connect. See also: IAM, Active Directory, Multi-Factor Authentication (MFA), Zero Trust Security.
SLA (Service Level Agreement)
A Service Level Agreement is a formal contract between a service provider and a customer (or between internal departments) that defines the expected level of service – including response times, availability guarantees, performance metrics, and consequences for failing to meet commitments. Key SLA metrics: Uptime/availability (e.g., 99.9% uptime = maximum 8.76 hours of downtime per year; 99.99% = 52 minutes); Response time (how quickly an issue is acknowledged); Resolution time (how quickly an issue is fixed); Incident classification (Priority 1 = business down, respond in 15 minutes; Priority 4 = minor issue, respond in 48 hours). SLAs are used in managed IT services, cloud hosting, internet services, and internal IT departments. Always read SLAs carefully before signing IT service contracts. See also: Managed IT Services, Cloud Computing, Help Desk.
Slack
Slack is a business messaging and collaboration platform that organises conversations into channels (persistent, searchable chat rooms organised by topic, project, or team), enabling asynchronous and real-time communication. Features: Channels (public or private, with thread replies keeping discussions organised); Direct messages; File sharing; Voice and video huddles (quick informal calls); Workflow automation; App integrations (2,000+ third-party integrations including GitHub, Jira, Salesforce, Google Drive). Slack competes directly with Microsoft Teams; it is more popular in technology companies and startups while Teams dominates enterprises using Microsoft 365. Slack AI (paid add-on) can summarise channels, search conversations with natural language, and generate daily digests. Free plan limits: message history limited to 90 days; limited integrations. Paid plans start at $8.75 AUD/user/month. See also: Teams Collaboration, Video Conferencing, SaaS.
Sleep Mode – See: Restart vs Shut Down vs Sleep vs Hibernate
Slow Computer – Causes and Fixes
A slow computer is the fix your slow computer today. Understanding the causes helps diagnose the right solution: Insufficient RAM – when RAM fills up, Windows uses the hard drive as virtual memory (extremely slow); solution: upgrade RAM to at least 16GB. HDD instead of SSD – the single biggest performance upgrade you can make; replacing a spinning hard drive with an NVMe SSD makes computers feel 10× faster. Too many startup programs – every program that auto-launches at startup slows boot time; disable via Task Manager > Startup. Malware / background processes – malware consumes CPU, RAM, and internet bandwidth; run a full antivirus scan. Overheating causing thermal throttling – blocked vents or dried thermal paste reduces CPU speed by 50–70%; clean vents, reapply thermal paste. Full storage drive – Windows needs 10–15% free space to operate efficiently; delete files or upgrade storage. Outdated hardware – computers over 5–7 years old may simply lack the processing power for modern software. Bloatware – manufacturer-installed software consuming resources; uninstall via Settings > Apps. See also: RAM, SSD, Thermal Throttling, Malware, Virtual Memory.
Smart Home Appliances
Smart appliances are household devices with internet connectivity, sensors, and control apps that allow remote monitoring and automation beyond their basic function. Examples: Smart refrigerator – internal cameras let you check contents remotely; expiry date tracking; automated shopping list generation; Smart washing machine and dryer – start, monitor, and receive completion alerts remotely; usage statistics; remote error diagnosis; Smart oven – preheating from your phone; guided cooking programmes; Smart dishwasher – cycle monitoring, energy tracking; Robot lawnmower – autonomous lawn mowing with perimeter wire or virtual boundary; scheduled operation; Smart air conditioner / HVAC – WiFi-enabled air conditioning control via app; Daikin, Mitsubishi, and Fujitsu all offer smart models in Australia; integrates with Google Home and Apple HomeKit; geofencing to pre-cool the home before you arrive. Practical considerations: smart appliance features require continuous app support; appliances outlive their software support; choose brands likely to maintain long-term app ecosystems. See also: Smart Home, IoT, Matter / Thread.
SMART Data (Self-Monitoring, Analysis and Reporting Technology)
SMART is a monitoring system built into hard drives and SSDs that tracks various health indicators and provides early warning of potential failure. SMART attributes include: Reallocated Sectors Count – number of bad sectors remapped to spare areas (a growing count is a serious warning); Spin Retry Count – number of times the spindle motor failed to spin up correctly; Uncorrectable Sector Count – sectors that could not be read; Temperature – drive operating temperature; Power-On Hours – total hours of operation; SSD Wear Leveling Count / Percent Life Remaining – SSD cell wear indicator. SMART data is accessed with tools like mechanical hard drive failure guide (Windows), DriveDX (Mac), or Smartmontools (Linux). A “SMART failure” warning in Windows or a BIOS prompt is a serious sign – professional data recovery service. See also: Bad Sectors, Hard Drive (HDD), SSD, Data Recovery.
Smart Video Doorbell
A smart video doorbell replaces a traditional doorbell with a camera-equipped internet-connected device that lets you see, speak to, and record whoever is at your door – from anywhere via smartphone app. Features: HD video (1080p or higher); Two-way audio; Motion detection with alerts; Night vision; Package detection (distinguishes parcels from people); and Doorbell chime (built-in or via existing chime). Power options: wired (connects to existing doorbell wiring); battery (rechargeable, no wiring needed but requires periodic charging). Popular brands: Ring (Amazon), Nest Hello (Google), Arlo, Eufy, and Unifi Protect. Storage: most offer cloud storage subscription (Ring Protect: ~$5–10/month) or local NVR storage. Privacy: video doorbells capture footage of public footpaths and neighbouring properties – review with your local council on privacy obligations. Security: always enable two-factor authentication and change default passwords. See also: IP Camera, Smart Home, IoT, NFC.
Smart Home / Home Automation
A smart home uses internet-connected devices and automation to remotely control and monitor home systems – lighting, heating and cooling (HVAC), security cameras, door locks, appliances, entertainment, and more – typically via a smartphone app or voice commands. Major platforms: Amazon Alexa, Google Home, Apple HomeKit, and Samsung SmartThings. Connectivity protocols used by smart home devices include Wi-Fi (long range, high bandwidth), Zigbee (low power mesh), Z-Wave (low power mesh, less interference), and Thread/Matter (the new universal standard designed to allow devices from different manufacturers to work together). Matter is particularly significant as it was developed collaboratively by Apple, Google, Amazon, and Samsung to eliminate smart home fragmentation. See also: IoT, Wi-Fi 6 / 6E / 7, NFC, Geofencing.
Smart Lock / Smart Home Security
A smart lock is a keyless electronic door lock that can be controlled via smartphone app, keypad code, fingerprint, voice command, or automated rules – without a physical key. Key features: Remote locking/unlocking – lock your front door from anywhere; Access codes – create temporary codes for tradespersons, guests, or Airbnb guests that expire automatically; Auto-lock – automatically locks after a set period; Activity log – see who unlocked the door and when; Integration – works with Apple HomeKit, Google Home, Amazon Alexa, and smart home systems; Geofencing – automatically unlocks when you arrive home. Connection types: Bluetooth (local only, requires phone proximity); Wi-Fi (remote access anywhere); Z-Wave/Zigbee (via smart home hub). Popular brands in Australia: Yale, Schlage, August, Lockly, and Ultraloq. Security note: smart locks add convenience but also new attack surfaces; choose locks from reputable brands with regular firmware updates; always keep a physical key backup. See also: Smart Home, IoT, Matter / Thread, Geofencing.
Smart Meter / Smart Grid
A smart meter is a digital electricity (or gas/water) meter that communicates consumption data to the utility provider automatically – eliminating manual meter reading visits – and provides near-real-time usage data to consumers. In Australia, smart meters (also called advanced metering infrastructure, AMI) are being progressively rolled out by smart home and IoT setup. Benefits: accurate bills (no more estimates); time-of-use tariffs (cheaper rates during off-peak hours like nights and weekends); visibility of your own usage patterns via apps; faster fault detection by the network; and enablement of solar feed-in tariff metering. A smart grid is the broader network infrastructure that uses digital communication, sensors, smart meters, and AI to manage electricity distribution more efficiently, integrate renewable energy sources, and balance supply and demand dynamically. See also: IoT, Smart Home, Edge Computing.
Smart Plug / Smart Power Strip
A smart plug is a Wi-Fi or Bluetooth-enabled power outlet adapter that plugs into a standard wall socket and allows any plugged-in device to be controlled remotely via smartphone app or voice assistant, regardless of whether the device itself is “smart.” Functions: remote on/off control (turn on a lamp from anywhere); scheduling (automatically turn off standby devices at night); energy monitoring (measuring actual power consumption of plugged-in devices); integration with Amazon Alexa, Google Home, and Apple HomeKit automation. Smart power strips extend this to multiple outlets. Energy monitoring smart plugs help identify “phantom loads” – devices consuming power in standby mode that contribute unnecessarily to electricity bills. Popular brands: TP-Link Kasa, Meross, Belkin Wemo, and IKEA Tradfri. See also: Smart Home, IoT, Wi-Fi.
Smart TV
A Smart TV is a television that includes a built-in internet connection and an operating system enabling streaming apps, web browsing, voice assistants, and app downloads – without requiring a separate streaming device. Popular Smart TV platforms include Google TV (formerly Android TV), Samsung Tizen, LG webOS, Amazon Fire TV (built-in), and Roku TV. Smart TVs connect to the internet via Wi-Fi or Ethernet and run streaming services like Netflix, Stan, Disney+, YouTube, and Apple TV+ natively. Security note: Smart TVs are IoT devices and may have limited security update support, especially after a few years. Use a strong Wi-Fi password, keep firmware updated, and consider a separate streaming stick (Chromecast, Apple TV, Roku) for a more regularly updated experience. See also: Streaming, IoT, HDMI, 4K / 8K Resolution.
Smartwatch Buying Guide
Choosing a smartwatch involves balancing features, ecosystem compatibility, health capabilities, and battery life: Ecosystem compatibility: Apple Watch only works with iPhone; Wear OS watches (Samsung Galaxy Watch, Google Pixel Watch) work best with Android but have limited iPhone compatibility; Garmin and Fitbit work with both platforms. Key features to consider: health sensors (heart rate, blood oxygen SpO2, ECG, skin temperature, sleep tracking, stress); GPS (built-in vs phone-connected – built-in needed for running without phone); cellular option (make calls/messages without phone); battery life (Apple Watch: 18–36 hours; Garmin: days to weeks; Fitbit: 5–7 days); display (always-on vs tap-to-wake); durability and water resistance; and app ecosystem. Apple Watch specific: Crash Detection and Fall Detection call emergency services automatically; Emergency SOS via satellite on Series 9+; health data integrates with iPhone Health app; Medication reminders. Australian considerations: ECG and irregular heart rhythm notifications are approved for use in Australia. Budget options: Fitbit Inspire series ($100–150 AUD) offer solid health tracking without smartwatch complexity. See also: Wearable Technology, Biometrics, Bluetooth.
SMB / File Sharing Protocols
Several protocols allow computers to share files across a network: SMB (Server Message Block) – the standard Windows file and printer sharing protocol; also called CIFS (Common Internet File System) in older versions; used when you access a network drive like servershare or map a network drive in Windows. Macs can connect to SMB shares (Finder > Connect to Server > smb://). SMB versions: SMBv1 (insecure, disabled in modern Windows; was exploited by WannaCry ransomware), SMBv2, SMBv3 (current, with encryption support). NFS (Network File System) – standard Unix/Linux file sharing; native on macOS and Linux. AFP (Apple Filing Protocol) – Apple’s legacy file sharing; deprecated in favour of SMB. WebDAV – file access over HTTP/HTTPS; used by cloud storage services, iCloud Drive, and some NAS devices; works through firewalls because it uses standard web ports. Mapped Network Drive – assigns a drive letter (e.g., Z:) to a network share so it appears as a local drive in File Explorer. See also: NAS, Server, Ethernet, Protocol.
SOC (Security Operations Centre)
A Security Operations Centre is a centralised team of cybersecurity professionals (and their supporting technology) that monitors, detects, analyses, and responds to cybersecurity incidents around the clock. A SOC continuously watches: network traffic, system logs, SIEM alerts, endpoint detection, threat intelligence feeds, and cloud service activity for signs of attacks. When a threat is detected, the SOC follows an incident response playbook to contain, eradicate, and recover from the incident while preserving evidence. Organisations with large SOCs include banks, critical infrastructure providers, major enterprises, and government agencies. Small-medium businesses use managed security and IT services (SOC as a Service) providers who monitor their environment for a monthly fee. Key SOC roles: Tier 1 analyst (alert triage), Tier 2 analyst (investigation), Tier 3 analyst / incident responder, and threat hunter. See also: SIEM, Firewall, Managed IT Services, Cybersecurity.
Social Engineering
Social engineering is a class of cyberattack that relies on psychological manipulation of people rather than technical exploits to gain access to systems, data, or funds. Instead of hacking into a computer, a social engineer hacks the human. Common techniques include: Phishing (impersonating trusted entities via email/SMS); Pretexting (fabricating a scenario to extract information – e.g., posing as IT support to get a password reset); Baiting (leaving USB drives with malware in car parks hoping employees will plug them in); Tailgating/piggybacking (physically following an authorised person through a secure door); and Vishing (impersonating ATO, banks, or tech companies via phone calls). Defending against social engineering requires how to protect yourself from social engineering and tech support scams – not just technical controls. See also: Phishing, Cybersecurity, Deepfake.
Social Media Account Security
Social media accounts are high-value targets for hackers – a compromised account enables: identity theft; spreading malware and scams to your contacts; reputational damage; and access to other accounts if you use the same email/password. Security for major platforms: Facebook/Meta: Settings & Privacy > Settings > Password and Security > enable Two-Factor Authentication; review “Where you’re logged in” and remove unfamiliar devices; check “Apps and websites” with access. Instagram: Settings > Account Centre > Password and Security > enable 2FA; review active sessions. Twitter/X: Settings > Security and account access > Security; enable 2FA. LinkedIn: Settings > Sign in & security; enable 2-Step Verification; review connected applications. TikTok: Profile > Settings > Security > Two-step verification. General rules: unique email and password for each platform; never reuse passwords; log out on shared devices; be cautious of “login with Facebook/Google” for third-party apps – these create additional access pathways; review app permissions regularly. If your account is hacked, use the platform’s “report a compromised account” flow immediately. See also: Multi-Factor Authentication (MFA), Password Manager, Phone Hacked, Digital Footprint.
Social Media Algorithm
Social media platforms use complex algorithms to determine what content appears in each user’s feed, discover tab, and search results – and in what order. These algorithms are proprietary, opaque, and constantly evolving. Key signals typically used: Relevance (how well content matches a user’s interests based on past behaviour); Engagement (likes, comments, shares, saves, view duration); Recency (newer content gets some preference); Relationships (content from friends, family, and followed accounts is prioritised); and Content quality signals (originality, production quality, caption length). For creators and businesses, “understanding the algorithm” means creating content that generates early, strong engagement. In Australia, concerns about algorithmic amplification of harmful content led to proposed regulations. See also: Artificial Intelligence, Digital Footprint, Screen Time.
Software Update – See: Windows Updates / Software Updates
Spam
Spam is any unsolicited bulk electronic message sent without the recipient’s permission. While most commonly associated with email, spam also occurs via SMS, social media direct messages, and robocalls. Spam ranges from unwanted commercial marketing to criminal scams (fake parcel delivery notifications, ATO impersonation, “you’ve won a prize”). In Australia, the Spam Act 2003 prohibits sending commercial electronic messages without consent and requires an easy unsubscribe option. Modern spam filters are sophisticated but not infallible – always check sender addresses carefully and never click suspicious links. Banks, the ATO, and government agencies will never ask for passwords, PINs, or personal information via unsolicited email. See also: Phishing, Cybersecurity.
Spam Filter / Email Security Gateway
A spam filter analyses incoming emails and assigns a score based on numerous signals to determine if a message is likely spam or malicious – then quarantines or deletes it before it reaches the inbox. Signals used include: sender reputation (is the IP on blacklists?); SPF/DKIM/DMARC authentication status; content analysis (suspicious words, excessive links, urgent language); attachment analysis (known malicious file signatures); URL reputation (are links on blocklists?); and machine learning models trained on millions of labelled examples. Email Security Gateways (Microsoft Defender for Office 365, Proofpoint, Mimecast, Barracuda) are enterprise-grade solutions adding: advanced threat protection, sandboxing (executing attachments in isolation to detect malware), data loss prevention, and email archiving. Even the best filters are not 100% accurate – phishing awareness and protection. See also: Spam, Phishing, Malware, SPF / DKIM / DMARC.
Speakers / Computer Speakers
Computer speakers are audio output devices that reproduce sound from a computer for general listening – music, video, notifications, calls, and games. Types: 2.0 system – two stereo speakers (left and right); standard configuration for desktops; 2.1 system – two satellite speakers plus a subwoofer for bass; fuller sound for music and movies; 5.1 / 7.1 surround sound – multiple speakers for immersive gaming and home theatre. Connectivity: 3.5mm audio jack (analogue), USB (digital, often better quality), Bluetooth (wireless). Speaker quality is measured by frequency response, power (watts RMS), and driver size. For gaming and movies, positional audio and surround sound are important. High-quality stereo speakers (Klipsch, Edifier, Audioengine) significantly outperform built-in laptop or monitor speakers. See also: Headphones / Headset, USB, Bluetooth.
SPF / DKIM / DMARC (Email Authentication)
Three complementary email authentication standards that work together to verify that emails claiming to be from a domain genuinely originate from authorised servers, preventing email spoofing and phishing: SPF (Sender Policy Framework) – a DNS record that specifies which mail servers are authorised to send email on behalf of your domain. Receiving mail servers check if the sender’s IP is in the SPF record. DKIM (DomainKeys Identified Mail) – adds a cryptographic digital signature to outgoing emails. Receiving servers verify the signature against a public key in your DNS, confirming the email was sent by your domain and hasn’t been tampered with in transit. DMARC (Domain-based Message Authentication, Reporting and Conformance) – builds on SPF and DKIM to specify what action receiving servers should take when authentication fails (none, quarantine to spam, or reject), and sends reports back to the domain owner about authentication failures. professional email setup and security should configure SPF, DKIM, and DMARC. See also: Email, Phishing, Spam, DNS, Cybersecurity.
Mac Privacy Controls (Privacy & Security Settings)
macOS provides granular privacy controls through System Settings > Privacy & Security, where users can review and control exactly which applications have access to sensitive resources. Permissions categories include: Camera; Microphone; Location Services (and which apps can access location always, when in use, or never); Contacts; Calendars; Photos (full, limited, or no access); Files and Folders (specifying individual folders each app can access); Screen Recording (critical – apps with this permission can see everything on your screen); Accessibility (apps that can control your Mac); and Full Disk Access. Regularly reviewing these permissions and revoking access for apps that don’t need it is an important privacy practice. If a newly installed app you don’t recognise has Screen Recording or Full Disk Access permissions, this Mac security audit and privacy review. See also: macOS Security, Privacy Act, Digital Footprint.
Spyware / Adware
Spyware is software that secretly monitors computer activity, collecting personal information, browsing habits, keystrokes, and credentials and transmitting it to third parties without your knowledge. Some spyware can even use your modem to dial premium-rate numbers. Adware displays unwanted advertising, may hijack browser homepage and search settings, and can redirect searches to affiliate pages. Both are typically bundled with free software downloads or installed through compromised websites. Legitimate applications sometimes include components that perform adware-like tracking. Protection: use free antivirus and anti-malware tools/anti-malware software, only download software from official sources, read installation wizards carefully, and avoid “free” software from unknown publishers. See also: Malware, Cybersecurity, Browser.
SSD (Solid State Drive)
A Solid State Drive stores data on NAND flash memory chips (the same technology as USB flash drives) rather than spinning magnetic platters. With no moving mechanical parts, SSDs are significantly faster, quieter, more energy efficient, more shock-resistant, lighter, and more reliable than traditional HDDs. A SATA SSD reads at ~500–600 MB/s; an NVMe SSD reads at 3,000–14,000 MB/s depending on generation. The practical benefits for everyday use are dramatic: Windows startup in under 10 seconds (vs 40–60 seconds on HDD), near-instant application loading, and snappy file operations. SSDs have become the standard storage for all new computers. The main disadvantage is higher cost per gigabyte than HDDs – though prices have fallen dramatically and SSDs now represent outstanding value. See also: NVMe SSD, Hard Drive (HDD), RAID, Cloud Backup.
SSH (Secure Shell)
SSH is a cryptographic network protocol that provides a secure, encrypted channel for remotely accessing and controlling computers over an untrusted network. It is the standard tool used by system administrators, developers, and DevOps engineers to log into remote Linux/Unix servers and execute commands as if sitting directly at the terminal. SSH uses public-key cryptography for authentication – rather than passwords, a pair of keys (private key kept secret on your computer, public key placed on the server) authenticate you. SSH also supports secure file transfer (SFTP), port tunnelling, and encrypted forwarding of other protocols. Exposed SSH on the public internet (default port 22) is continuously targeted by automated brute-force attacks – always use key-based authentication and consider changing the default port. See also: Encryption, Server, Linux, Cybersecurity.
Stalkerware / Spyware (Mobile)
Stalkerware (also called spouseware or monitoring apps) is a category of mobile malware that secretly monitors a device’s location, calls, texts, emails, social media, photos, and sometimes activates the microphone and camera – sending all data to whoever installed it. Unlike legitimate parental monitoring apps (which are transparent), stalkerware hides itself from the device owner and operates covertly. It is most commonly installed by intimate partners, abusive family members, or employers. Signs of stalkerware: battery draining fast; data usage higher than expected; phone running warm when idle; partner seeming to know private information. If you suspect stalkerware: be careful – removing it may alert the abuser; help with device security and stalkerware (1800RESPECT: 1800 737 732) before acting; the Coalition Against Stalkerware (stopstalkerware.org) provides guidance. A factory reset removes stalkerware but also removes evidence. See also: Spyware, Phone Security Checklist, Factory Reset, Cybersecurity.
Starlink
Starlink is a satellite internet service developed and operated by SpaceX (Elon Musk’s space company), delivering broadband internet via a rapidly expanding constellation of Low-Earth Orbit (LEO) satellites positioned 340–1,200 km above Earth. Unlike traditional geostationary satellite internet (which orbits at 35,786 km, producing latency of 500–700ms), Starlink’s low-altitude satellites achieve latency of 20–60ms – comparable to fixed NBN broadband. Download speeds in Australia typically range from 50 to 300+ Mbps, with speeds expected to improve as more satellites launch. Starlink is available across all of Australia including very remote areas beyond NBN coverage. Hardware: the user terminal (“Dishy McFlatface”), Gen 3 router, and mounting hardware; one-off equipment cost approximately $599 AUD. need help setting up Starlink or NBN? approximately $139 AUD (residential), with higher-tier plans available. Starlink is also available for RVs (mobile use), maritime vessels, aviation, and business/enterprise customers. See also: Broadband, Latency, NBN, ISP.
Steam / PC Gaming Platforms
Steam (Valve Corporation) is the dominant digital distribution platform for PC games, with over 130 million active users and 50,000+ games in its library. Key features: game purchase and download; automatic updates; cloud saves (game progress synced across computers); Steam Workshop (user-created game modifications); Steam Community (forums, reviews, achievements); Steam Remote Play (stream games to a TV or another device); and Steam Guard security. Competing PC gaming platforms: Epic Games Store (regular free game giveaways; Fortnite launcher; Unreal Engine games); GOG (DRM-free games; classic game preservation); Battle.net (Blizzard: Diablo, Overwatch, Warcraft); EA App (EA/Origin games); Ubisoft Connect; Xbox Game Pass for PC (subscription including hundreds of games). Steam security: enable Steam Guard Mobile Authenticator (2FA via app); be wary of Steam phishing scams – they are extremely common (fake trade offers, fake Steam login pages sent via DMs). See also: Gaming Console, Cloud Gaming, GPU.
Storage Interfaces (SATA / NVMe / SAS)
The interface connects a storage device to the motherboard and determines the maximum possible transfer speed. SATA III (Serial ATA) – the legacy standard; maximum ~600 MB/s theoretical, ~550 MB/s practical; still used for 2.5″ SSDs and all traditional HDDs; uses a wide, flat cable. NVMe (Non-Volatile Memory Express) over PCIe M.2 – the modern standard for SSDs; plugs directly into an M.2 slot on the motherboard; PCIe 3.0: ~3,500 MB/s; PCIe 4.0: ~7,000 MB/s; PCIe 5.0: ~14,000 MB/s. SAS (Serial Attached SCSI) – enterprise standard for data centre drives; more reliable and higher endurance than consumer drives; supports hot-swapping and dual-port redundancy; up to 24 Gbps. U.2 – enterprise NVMe in a 2.5″ form factor with SAS-style connector. See also: SSD, NVMe SSD, Hard Drive (HDD), PCIe.
Streaming Audio and Video
Streaming delivers media content in real-time over the internet, allowing playback to begin immediately while the remainder buffers – unlike downloading, where the complete file must be received before playback. The streamed content is not permanently stored on your device. Major Australian streaming services include Netflix (movies/TV), Stan, Disney+, Binge, Amazon Prime Video, Apple TV+, and Paramount+ for video; Spotify, Apple Music, Amazon Music, and YouTube Music for audio. Live streaming (Twitch, YouTube Live, Facebook Live) broadcasts in real-time to audiences. Streaming quality requirements: 4K HDR streaming requires 25+ Mbps stable bandwidth per stream. Household internet plans should factor in multiple simultaneous streams. See also: Bandwidth, NBN, 4K / 8K Resolution.
Streaming Stick / Streaming Device
A streaming stick (or streaming device) is a compact device that plugs into a TV’s HDMI port and adds smart TV functionality – streaming apps, voice control, and internet connectivity – to any television. Amazon Fire TV Stick – the most popular globally; runs Fire OS (Android-based); Alexa voice control; affordable; large app selection. Google Chromecast / Google TV Stick – supports Google Assistant; excellent Android integration; Google TV interface aggregates content across services. Apple TV 4K – premium option; tightly integrated with iPhone/iPad (AirPlay, Apple Arcade, Apple Fitness+); runs tvOS; required for HomeKit home hub functionality; Matter / Thread border router. Roku Streaming Stick – brand-neutral platform (no preference for any streaming service); US-origin but available in Australia. Choosing: streaming device setup and configuration; Chromecast for Android/Google users; Fire Stick for budget buyers with Alexa; Roku for no-ecosystem preference. See also: Streaming, HDMI, Smart TV, 4K / 8K Resolution.
Stylus / Digital Pen
A stylus is a pen-shaped input device used to interact with touchscreens and drawing tablets, providing more precision than a finger. Types: Passive (capacitive) stylus – a simple conductive tip that mimics a finger; no battery required; no pressure sensitivity; suitable for basic navigation and writing; Active stylus – battery-powered, communicates with the device; supports pressure sensitivity (detecting how hard you press), tilt recognition, palm rejection, and programmable buttons. Notable active stylus products: Apple Pencil (1st and 2nd gen for iPad); Microsoft Surface Pen; Samsung S Pen; Wacom stylus for professional drawing tablets. Pressure levels (1,024, 2,048, 4,096, 8,192) indicate sensitivity – higher is better for artists. See also: Drawing Tablet, Touchscreen.
Subnet / Subnetting
Subnetting is the practice of dividing a large IP network into smaller subnetworks (subnets), each acting as an independent network segment. A subnet is defined by its IP address range and a subnet mask (or CIDR notation prefix length like /24). For example, 192.168.1.0/24 is a subnet containing IP addresses from 192.168.1.1 to 192.168.1.254 (254 usable host addresses). Reasons for subnetting: improving network performance (reducing broadcast traffic); security (different subnets for different departments or device types, enforced by firewall rules); efficient use of IP address space; and simplified management. Home networks typically use a single /24 subnet. Enterprise networks use many subnets – one for servers, one for Wi-Fi clients, one for IoT devices, one for CCTV, and so on. See also: IP Addressing, VLAN, Firewall.
Supply Chain Attack
A supply chain attack targets an organisation indirectly by compromising the software, hardware, or services it relies on from third-party vendors. Rather than attacking a well-defended company directly, attackers infiltrate a less-secure supplier and use that access to reach the real target. The 2020 SolarWinds attack is a landmark example: attackers inserted malicious code into a widely used IT management software update, which was then automatically installed by thousands of organisations including US government agencies. Other examples include compromised open-source software packages (the XZ Utils backdoor in 2024) and tampered hardware shipped from the factory. Supply chain attacks are particularly dangerous because victims trust updates from known vendors. Mitigations include: software composition analysis, code signing verification, monitoring for unusual behaviour from trusted tools, and our business IT security services. See also: Cybersecurity, Malware, Zero Trust Security.
Surge Protector / Power Board
A surge protector (also called a surge-protected power board) protects electrical equipment from voltage spikes (power surges) caused by lightning strikes, power grid switching, or the startup of large electrical motors (fridges, air conditioners). A surge can destroy sensitive electronics instantly or degrade them over time. A basic power board simply distributes power; a surge-protected board contains metal oxide varistors (MOVs) that absorb excess voltage and redirect it to earth. For computers, monitors, and networking equipment, always use a quality surge-protected power board. Look for boards with a joule rating (higher = more protection) and an indicator light showing protection is active. A UPS (Uninterruptible Power Supply) provides surge protection plus battery backup. See also: UPS, PSU.
Sync / Cloud Sync
Synchronisation (sync) is the process of ensuring that data is consistent and up to date across multiple devices or between a device and a cloud service. When you take a photo on your iPhone and it instantly appears in the Photos app on your Mac, iCloud sync is doing that work. Types of sync: Cloud sync – automatic two-way synchronisation between devices via a cloud service (iCloud, Google Drive, OneDrive, Dropbox); Contact/calendar sync – keeping contacts and calendar events identical across phone, computer, and tablet; Browser sync – bookmarks, passwords, and history available on all your logged-in browsers; Music sync – playlists available across all devices. Sync conflicts (when the same file is edited on two devices simultaneously) are a common cause of data duplication or loss. See also: Cloud Computing, Cloud Backup, Browser.
System Restore
System Restore is a Windows feature that creates and uses “restore points” – snapshots of the Windows system files, registry, installed programs, and drivers at a specific point in time – allowing you to roll Windows back to an earlier state if a problem occurs (such as a bad driver installation, malware infection, or failed Windows Update). System Restore does not affect personal files (documents, photos). Access via: Start > search “Create a restore point” > System Restore. Or boot into professional Windows repair and recovery if Windows won’t start (Startup Repair). System Restore points are automatically created before Windows Updates, driver installations, and application installations. If System Restore is disabled (common on budget PCs to save disk space) or restore points are deleted, this option is unavailable. See also: Shadow Copy, Data Recovery, Windows Updates.
Tablet vs Laptop – Which Should You Choose?
Tablets and laptops serve different needs and the right choice depends on how you use technology: Tablets are better for: casual browsing, streaming, reading, social media; portability (lighter, thinner); touch-first apps (drawing, photography); children’s education; presentations; and use as a second device. Major tablets: iPad (Apple, best-in-class; runs iPadOS; with Magic Keyboard approaches laptop functionality); Samsung Galaxy Tab (Android; good value); Microsoft Surface Pro (Windows tablet with keyboard – bridges both categories). Laptops are better for: creating documents, spreadsheets, and presentations; complex software (accounting, design, programming); multiple tabs and applications simultaneously; hardware upgrades; connecting to external monitors and peripherals; and any task requiring a keyboard for extended periods. The hybrid option: 2-in-1 convertible laptops (Microsoft Surface Pro, Lenovo Yoga, HP Spectre x360) function as both; the best compromise if you genuinely need both modes. For most Australians who need a primary computing device for work, a laptop remains more versatile; a tablet makes an excellent companion device. See also: Laptop Buying Guide, Computer, Screen Time.
Tape Backup / LTO Tape
Magnetic tape remains widely used for data backup and long-term archiving in enterprise environments despite being a decades-old technology – because it offers the lowest cost per gigabyte of any storage medium and can hold enormous capacities. LTO (Linear Tape-Open) is the dominant enterprise tape standard: LTO-9 cartridges store up to 18TB native (45TB compressed); LTO-8 stores up to 12TB native. Tape is sequential access (you must scan through the tape to find specific data) rather than random access (like disks), making it slow for restore operations. Key tape advantages: cost (approximately 1–2 cents per GB); offline storage (immune to ransomware if kept offline); longevity (tapes can last 30+ years in proper conditions); and energy efficiency (no power consumed when stored). Tape is used by cloud providers (Amazon, Google use tape for Glacier/cold storage archives), media and entertainment companies for video archives, and financial institutions. See also: Cloud Backup, RAID, Data Recovery.
Task Manager
Task Manager is a built-in Windows tool that shows all running programs, background processes, and system resource usage in real time. You can use it to: force-close a frozen or unresponsive application (right-click the app > End Task); see which programs are using the most CPU, memory, or disk; monitor overall system performance; check startup programs (and disable ones that slow startup); and view network activity. Open Task Manager with: Ctrl+Shift+Esc (fastest method) or Ctrl+Alt+Delete > Task Manager or right-clicking the taskbar. The macOS equivalent is Activity Monitor. See also: Crash / Freeze / Hang, CPU, RAM, Boot / Startup.
Task Scheduler / Startup Programs
Task Scheduler is a Windows built-in tool that runs programs, scripts, or commands automatically at specified times, on system events (startup, login, idle), or on a repeating schedule. Legitimate uses include Windows Update tasks, antivirus scans, disk defragmentation, and software update checkers. Malware frequently abuses Task Scheduler to persist on a system and re-launch after removal attempts – a malicious task continues to run even if the malware file is deleted. Startup programs are applications that automatically launch when Windows starts, managed via Task Manager (Ctrl+Shift+Esc > Startup tab) or the Startup folder (shell:startup). Disabling unnecessary startup programs (Teams, Spotify, OneDrive, printer software, browser updaters) significantly improves boot time and system performance. To audit Task Scheduler: search for “Task Scheduler” in Start, then check the Task Scheduler Library for any unfamiliar tasks. See also: Boot, Malware, Windows Registry, Task Manager.
Taskbar
The taskbar is the bar running along the bottom of the Windows screen (by default) that contains: the Start button (Windows logo, opens the Start Menu); pinned shortcuts to frequently used programs; icons showing currently open programs; and the System Tray (notification area) on the right showing the clock, battery, Wi-Fi, volume, and icons for background programs. In Windows 11, the taskbar and Start button are centred by default (though they can be moved to the left in Settings). You can pin programs to the taskbar by right-clicking them > “Pin to taskbar” for one-click access. The macOS equivalent is the Dock. See also: Desktop (UI), Icon, Shortcut.
Microsoft Teams
Microsoft Teams is Microsoft’s collaboration platform combining: Chat (instant messaging, individual and group); Video and audio calls (one-to-one and group, with screen sharing); Channels (persistent threaded conversations organised by topic within a Team); File sharing (files stored in SharePoint, accessible in Teams); Meetings (scheduled, with recording, transcription, and AI summaries via Copilot); Phone calls (with Teams Phone add-on, replacing traditional PBX); and App integrations (hundreds of third-party apps). Teams has become the dominant enterprise communication platform in Australia, largely replacing email for internal communication and traditional phone systems in many organisations. Teams is included in all Microsoft 365 Business plans. Teams Essentials is available as a standalone free-ish option. Security note: Teams chats are archived and can be accessed by IT administrators and in legal discovery processes – treat Teams messages as you would any business communication. See also: Microsoft 365, Video Conferencing, VoIP, SharePoint.
Tech Support Scam
Tech support scams are a prevalent form of fraud targeting particularly older Australians. Common scenarios include: a phone call from someone claiming to be from “Microsoft,” “Telstra,” or “the NBN” warning that your computer has been hacked or has a virus; a browser pop-up with an alarming message and phone number claiming your computer is infected; and email warnings about account problems requiring immediate action. The scammer’s goal is to gain remote access to your computer (via AnyDesk or TeamViewer) and/or convince you to pay hundreds of dollars for fake “repairs.” Legitimate companies like Microsoft, Telstra, and the NBN do not make unsolicited calls about your computer. If you receive such a call, hang up. If you’ve already given remote access, disconnect from the internet immediately and contact a a legitimate PC repair professional. our guide to protecting yourself from tech support scams (scamwatch.gov.au). See also: Cybersecurity, Social Engineering, Remote Desktop, Managed IT Services.
Telehealth / Digital Health
Telehealth refers to the delivery of healthcare services, consultations, monitoring, and education through digital technology and the internet, enabling patients and healthcare providers to connect without physical visits. Services include: video consultations with GPs, specialists, and allied health professionals; remote patient monitoring (wearable sensors transmitting vital signs to healthcare teams); mental health support via apps and online therapy platforms; medication management and prescription services; and chronic disease management programmes. In Australia, computer setup for telehealth and remote work a broad range of telehealth services following COVID-19 expansion. Major platforms include HotDoc, Healthengine, Eucalyptus, and GP2U. Digital health also encompasses Electronic Health Records (EHR), clinical decision support AI, and population health analytics. See also: Wearable Technology, IoT, Cloud Computing, Privacy Act.
Thermal Imaging (Computer Diagnostics)
Thermal imaging cameras detect and display infrared radiation (heat) emitted by objects, showing temperature differences as colour gradients – typically with cool areas shown in blue/purple and hot areas in orange/red. In computer hardware diagnostics, thermal imaging is used to: identify components running abnormally hot; locate cold solder joints on circuit boards (which appear cooler than surrounding components); find failing capacitors; diagnose power delivery issues on motherboards; and pinpoint overheating areas on laptop logic boards before they fail catastrophically. Professional computer repair technicians use FLIR or similar thermal cameras for non-invasive diagnostics. Thermal imaging can identify problems invisible to the naked eye before they cause data loss or complete system failure. thermal imaging computer diagnostics as a diagnostic service. See also: Thermal Throttling, Thermal Paste, CPU, Motherboard.
Thermal Paste / Thermal Interface Material
Thermal paste (also called thermal compound, thermal grease, or TIM – Thermal Interface Material) is a heat-conductive substance applied between a CPU (or GPU) and its heatsink/cooler to maximise heat transfer. At the microscopic level, both processor and heatsink surfaces have tiny imperfections and air gaps; thermal paste fills these gaps, as metal conducts heat far better than air. Over time (typically 3–7 years), thermal paste dries out and loses effectiveness – a common cause of CPU overheating and thermal throttling in ageing laptops and desktops. professional laptop thermal paste replacement is one of the most effective and inexpensive ways to computer overheating repair service in an older computer. Popular thermal pastes include Arctic MX-4, Thermal Grizzly Kryonaut (for professionals), and the paste included in boxed CPU coolers. See also: Thermal Throttling, CPU, Laptop Repairs.
Thermal Throttling
Thermal throttling (also called CPU or GPU throttling) is a protective mechanism where a processor automatically reduces its clock speed (and therefore performance) to prevent damage from overheating. When a CPU or GPU exceeds its maximum safe operating temperature (typically 90–100°C), it throttles down to reduce heat generation. Causes of thermal throttling include inadequate cooling (dirty or blocked vents, dried-out thermal paste, faulty fans), running demanding workloads in a hot environment, or an ageing laptop whose cooling system is no longer effective. Symptoms include sudden dramatic slowdowns during demanding tasks and a very hot device. Solutions include cleaning the vents and fans, laptop repair service on the CPU/GPU, improving case airflow (desktop PCs), or using a cooling pad (laptops). See also: CPU, GPU, Overclocking.
Thin Client
A thin client is a low-powered computer or terminal that relies primarily on a central server to do the heavy computing work, rather than performing processing locally. Instead of running full applications on each workstation, thin clients run a minimal local OS and connect to virtual desktops or applications hosted on a server. Benefits include: lower hardware cost per workstation, easier management (updates and changes made centrally on the server), longer device lifespan, better security (data stays on the server, not individual devices), and lower power consumption. Thin clients are popular in enterprise environments, call centres, schools, healthcare, and government where standardised, manageable workstations are needed. Modern thin client implementations often use Virtual Desktop Infrastructure (VDI) platforms like VMware Horizon or Citrix Virtual Apps. See also: Virtualisation, Cloud Computing, Server, Remote Desktop.
Threat Intelligence
Threat intelligence is evidence-based knowledge about existing or emerging cyber threats – including information about attacker tactics, techniques, and procedures (TTPs), indicators of compromise (IOCs), and contextual information that helps organisations make informed security decisions. Sources include: commercial threat intelligence feeds (CrowdStrike, Recorded Future, Mandiant); open-source intelligence (OSINT); government sharing organisations (AusCERT in Australia, CISA in the US); industry-specific ISACs (Information Sharing and Analysis Centres); and dark web monitoring. Types: Strategic intelligence (high-level trends for executives); Tactical intelligence (TTPs for security teams); Operational intelligence (specific attacks in progress); Technical intelligence (IOCs like malicious IPs and file hashes for automated systems). See also: Cybersecurity, SIEM, Patch Management.
Thunderbolt / USB-C
USB-C is the small, reversible connector standard now universal on modern laptops, smartphones, tablets, and peripherals. A single USB-C cable can carry data, video output, and power simultaneously. Importantly, “USB-C” refers to the connector shape, not the speed or protocol – capabilities vary significantly: a USB-C port might support USB 2.0 (480 Mbps) or USB 3.2 Gen 2 (20 Gbps) or Thunderbolt. Thunderbolt is a high-performance protocol developed by Intel and Apple that uses the USB-C connector. Thunderbolt 4 delivers 40 Gbps, while Thunderbolt 5 (released 2023) doubles this to 80–120 Gbps. Thunderbolt enables: external GPU (eGPU) docks, high-speed external NVMe storage enclosures, daisy-chaining up to six peripherals on one cable, dual 4K/8K monitor output, and high-wattage charging. See also: USB, HDMI, PCIe.
Time Machine
Time Machine is Apple’s built-in automatic backup software for Mac, designed to be the simplest possible backup solution. When connected to an external drive or a Time Capsule (discontinued) or AirPort Time Capsule, Time Machine automatically backs up your entire Mac hourly for the past 24 hours, daily backups for the past month, and weekly backups for all previous months – until the backup drive is full, at which point the oldest backups are deleted. Restoring files: open Time Machine (clock icon in menu bar or Launchpad), navigate back in time using the timeline on the right, browse your file system at any point in the past, and restore individual files or your entire Mac. professional Mac data recovery when you accidentally delete a file on a Mac. For complete data protection, combine Time Machine with cloud backup (iCloud, Backblaze) – Time Machine alone does not protect against theft, fire, or the backup drive failing simultaneously. See also: Cloud Backup, Data Recovery, RAID.
Tokens / Context Window
In AI language models, a token is the basic unit of text the model processes – approximately 3–4 characters or 0.75 words in English. “Hello, world!” is about 4 tokens. Models don’t see whole words; they process token sequences. Tokenisation matters for: API pricing (most AI APIs charge per token); understanding model capabilities; and input/output length limits. The context window (or context length) is the maximum number of tokens a model can process at once – both the input prompt and the output response combined. GPT-4 has a 128,000 token context window (roughly 100,000 words); Claude’s context window can be even larger. A larger context window allows processing entire books, long documents, or lengthy conversation histories in a single query. See also: Large Language Model (LLM), Prompt Engineering, API.
Toner vs Ink – Inkjet vs Laser
Understanding the difference between inkjet and laser printing technology helps you choose the right printer and manage running costs: Inkjet printers use liquid ink sprayed through microscopic nozzles onto paper. Ink cartridges (small, expensive per ml). Advantages: excellent photo print quality; lower upfront cost; compact size; handles glossy and specialist papers. Disadvantages: ink dries out if not used regularly (clogged heads); high cost per page for text; slower for large print volumes. Best for: home users printing occasional documents and photos; low-volume printing. Laser printers use toner powder (fine plastic particles) fused onto paper by heat. Toner cartridges are expensive upfront but last much longer. Advantages: fast; cheap per-page cost for text; toner doesn’t dry out during storage; sharp text. Disadvantages: higher upfront cost; bulkier; less ideal for photo printing. Best for: offices, high-volume printing, and anyone printing primarily text documents. Ink tank printers (Epson EcoTank, Canon MegaTank) address inkjet running costs by using refillable tanks instead of cartridges – very low ongoing cost but higher initial price. See also: Printer, All-in-One Printer, DPI Printing.
Touchpad / Trackpad
A touchpad (also called a trackpad) is the flat, rectangular touch-sensitive surface built into laptops that controls the mouse cursor without needing a separate mouse. Basic gestures: Single tap = left-click; Two-finger tap = right-click; Two-finger scroll = scroll up/down/sideways; Two-finger pinch = zoom in/out; Three-finger swipe = switch between apps or virtual desktops; Four-finger swipe = show all open windows. Touchpad sensitivity and gestures can be customised in Settings > Bluetooth & devices > Touchpad. Apple’s MacBook trackpad is widely considered the gold standard for touchpad responsiveness and gesture support. An external USB or Bluetooth mouse is an option if you prefer traditional navigation. See also: Mouse, Cursor.
Touchscreen
A touchscreen allows you to interact with a computer or device directly by touching the screen with your fingers, a stylus, or a pen, rather than using a mouse. Most smartphones and tablets use touchscreens as their primary input method. Many modern Windows laptops have touchscreens (particularly Surface devices and 2-in-1 convertibles). Basic touchscreen gestures: Tap = click; Double-tap = double-click or zoom in; Swipe = scroll; Pinch (two fingers together/apart) = zoom out/in; Long press = right-click/context menu; Swipe from edge = access system features. Modern touchscreens use capacitive technology that detects the electrical properties of your fingertips – they do not respond to a stylus unless it is an active capacitive pen (like the Apple Pencil or Microsoft Surface Pen). See also: Cursor, Scroll.
TPM (Trusted Platform Module)
A TPM is a dedicated security chip (or firmware implementation) built into modern computers that provides hardware-based cryptographic functions. The TPM stores encryption keys, certificates, and passwords in a physically secured chip that is isolated from the main processor, making it much harder for malware or physical attacks to extract stored secrets. Key functions: secure storage of BitLocker drive encryption keys; hardware-based device identity for enterprise management; securing the boot process (Secure Boot); and providing a hardware root of trust for security software. Windows 11 requires TPM 2.0 – one of the minimum hardware requirements that made some older PCs ineligible to upgrade. TPM is also foundational to passwordless authentication (Windows Hello, FIDO2 passkeys). See also: BIOS / UEFI, Encryption, Windows Hello, Cybersecurity.
Tracking Pixel
A tracking pixel (also called a web beacon or spy pixel) is a tiny, often invisible 1×1 pixel image embedded in emails, web pages, or online advertisements. When the pixel loads, a request is sent to the tracker’s server – revealing that the email was opened, the page was visited, or the ad was seen – along with the viewer’s IP address, approximate location, device type, email client, and time of access. Email tracking pixels are used by: marketers to track email open rates; sales teams to know when a prospect has opened a proposal; and surveillance actors. Many email clients (Apple Mail with Mail Privacy Protection, Proton Mail, HEY) now block tracking pixels by loading all images through a proxy server or pre-fetching them before displaying. You can often identify tracking pixels by checking the full email headers for third-party image domains. See also: Cookie, Digital Footprint, Email, Browser Fingerprinting.
Transformer Architecture
The Transformer is the neural network architecture introduced in the 2017 Google paper “Attention is All You Need” that became the foundation of virtually all modern large AI models. The key innovation was the attention mechanism – allowing the model to weigh the relevance of every word to every other word in a sequence simultaneously, rather than processing text one token at a time. This enabled training on much larger datasets with parallel processing. Almost all modern AI language models (GPT, Claude, Gemini, LLaMA) are transformer-based. The two main transformer variants: Encoder-only (BERT – good for classification, sentiment analysis); Decoder-only (GPT-style – good for text generation); and Encoder-decoder (T5, original Transformer – good for translation, summarisation). See also: Large Language Model (LLM), Neural Network, Deep Learning, GPU.
TRIM (SSD Maintenance Command)
TRIM is a command that allows the operating system to inform an SSD which data blocks are no longer in use and can be wiped. Because SSDs cannot overwrite data directly (they must erase an entire block before writing to it), TRIM enables the SSD controller to pre-emptively erase deleted data during idle periods, maintaining optimal write performance over the life of the drive. Without TRIM, SSD write performance degrades over time as the controller must erase and rewrite full blocks before storing new data. TRIM is supported on all modern Windows versions (7 and later), macOS, and Linux. Verify TRIM is active in Windows by running fsutil behavior query DisableDeleteNotify in Command Prompt (0 = TRIM enabled). The implication for data recovery: on an SSD with TRIM active, deleted data is typically erased within minutes to hours, making recovery of deleted files from SSDs significantly harder than from traditional HDDs. See also: SSD, Data Recovery, Overwrite.
Trojan Horse (Trojan)
A Trojan horse (or simply Trojan) is malware disguised as legitimate, useful software to trick users into installing it. Unlike viruses and worms, a Trojan does not self-replicate – it relies entirely on users voluntarily installing it. Once installed, a Trojan can: open a backdoor for remote access by attackers (RAT – Remote Access Trojan); steal credentials and banking information; download and install additional malware; enlist the device in a botnet; or spy on the user via webcam or microphone. Trojans are commonly distributed via: software piracy sites and crack tools; fake software updates presented in pop-ups; email attachments; and malicious mobile apps outside official app stores. See also: Malware, Ransomware, Phishing, Cybersecurity.
Turing Test
The Turing Test was proposed by British mathematician and computer scientist Alan Turing in his 1950 paper “Computing Machinery and Intelligence.” The test asks: can a machine exhibit intelligent behaviour indistinguishable from that of a human? In Turing’s “imitation game,” a human interrogator holds text conversations with both a human and a machine; if the interrogator cannot reliably tell which is which, the machine passes the test. The Turing Test became a foundational concept in AI, philosophy of mind, and computer science. With modern LLMs like GPT-4 and Claude routinely producing human-like text, many argue these models have “passed” informal versions of the Turing Test – though critics note this reflects impressive pattern matching rather than genuine understanding or consciousness. The test sparked ongoing philosophical debates about the nature of intelligence, consciousness, and what it means to “think.” See also: Artificial Intelligence, Large Language Model (LLM).
Passkey (Passwordless Authentication)
A passkey is a newer, more secure and convenient alternative to passwords for logging into websites and apps, based on the FIDO2/WebAuthn standard developed by Apple, Google, Microsoft, and the FIDO Alliance. Instead of a password that can be stolen or phished, a passkey uses public-key cryptography tied to your device’s biometric authentication (Face ID, Touch ID, Windows Hello, or device PIN). When you register a passkey: your device generates a private key (stored securely on the device, never leaves it) and a public key (stored on the website’s server). To log in, you verify with biometrics and the device signs a challenge with the private key – the server verifies with the public key. Even if the server is hacked, your private key was never there. Passkeys cannot be phished. cybersecurity and account security setup, Google, Apple, Microsoft, GitHub, and hundreds of major websites now support passkeys. See also: Multi-Factor Authentication (MFA), Biometrics, TPM, Encryption.
Authenticator App
An authenticator app generates time-based one-time passwords (TOTP) for two-factor authentication – a six-digit code that changes every 30 seconds, derived from a shared secret key and the current time. Unlike SMS-based 2FA (which can be intercepted via SIM swapping), authenticator app codes are generated entirely on-device without network connectivity, making them professional MFA and security setup. When you enable 2FA on an account, you scan a QR code with the authenticator app to establish the shared secret; thereafter, in addition to your password, you enter the current code from the app. Popular authenticator apps: Google Authenticator (simple, widely supported); Microsoft Authenticator (also supports passwordless sign-in for Microsoft accounts); Authy (supports multi-device backup); 1Password and Bitwarden (integrate 2FA codes into the password manager). See also: Multi-Factor Authentication (MFA), Password Manager, SIM Card.
MFA Backup Codes / Account Recovery
When you set up two-factor authentication (2FA), most services provide one-time backup codes – a set of 8–10 emergency codes that each work once to bypass 2FA if you lose access to your authentication method (phone broken, authenticator app deleted, phone number changed). These codes are critically important to save safely: store in your password manager, print and keep in a secure location, or store in an encrypted file. Other account recovery methods: Recovery phone number – a secondary phone number; keep this updated; SMS recovery is less secure than authenticator app but better than no fallback. Recovery email – a secondary email address; ensure it is secure. Recovery key – Apple ID, FileVault, and BitLocker all generate recovery keys at setup; these are essential for regaining access if locked out. Trusted contacts (Facebook, Apple) – designate trusted people who can help you recover access. The professional account security setup you’ve lost your 2FA recovery options is after you’ve lost access to your account. See also: Multi-Factor Authentication (MFA), Password Manager, Apple ID.
Google Account Security / Android Account Security
Your Google account is the master key to Android – controlling access to Gmail, Google Drive, Google Photos, the Play Store, Chrome passwords, Google Pay, YouTube, and every app signed in with Google. Securing it is critical: Two-Step Verification – Google’s MFA; go to myaccount.google.com/security > 2-Step Verification; use Google Authenticator or Google Prompts rather than SMS when possible; consider a physical security key (YubiKey) for the highest protection; Review connected apps – myaccount.google.com/permissions shows every app with access to your Google account; revoke any you don’t recognise or no longer use; Google Account Security Checkup – myaccount.google.com/security-checkup; Passkey – Google now supports passkeys for passwordless login; Recovery account – keep a backup email and phone number updated. If your Google account is compromised, every Android device and service linked to it is at risk. See also: Multi-Factor Authentication (MFA), Android Security, Passkey.
Undelete / File Recovery Software
Undelete (file recovery) software attempts to recover files that have been accidentally deleted and no longer visible in the Recycle Bin. When a file is deleted, the file system marks the space as available but does not immediately erase the data – until new data is written over it, the original content may be recoverable. The key factors for successful undelete: professional file recovery service (the less the drive is used after deletion, the less likely the data has been overwritten); do not install recovery software onto the same drive you are recovering from (this could overwrite the deleted data); if possible, create a disk image first and recover from the image. Popular free/freemium recovery tools: Recuva (Windows, free, beginner-friendly), PhotoRec (cross-platform, free, open source, no GUI), Disk Drill. Professional tools: R-Studio, GetDataBack, O&O DiskRecovery. Recovery from SSDs with TRIM active is much less reliable. See also: Data Recovery, TRIM, Recycle Bin, Disk Image.
Undo and Redo
Undo (Ctrl+Z / Cmd+Z) reverses the most recent action in a program, stepping back through your actions one at a time. Redo (Ctrl+Y / Cmd+Shift+Z) reapplies an action that was just undone. Undo/Redo works in almost every application: word processors, spreadsheets, graphic editors, web browsers (undo typing), and file operations. Most programs maintain a history of many actions (sometimes hundreds) so you can undo multiple steps. Important exceptions: some actions cannot be undone – permanently deleting files (bypassing the Recycle Bin), overwriting a saved file, and some database changes. Habitually pressing Ctrl+Z when something goes wrong is one of the most useful computing habits. See also: Keyboard Shortcuts, Clipboard.
Upload
An upload is the transfer of data from your local device to a remote server or another computer over the internet. Uploading includes: sending email attachments, posting photos and videos to social media, backing up files to cloud storage, video conferencing (uploading your camera and microphone stream), live streaming, and submitting files to websites. Upload speed (Mbps) is typically much lower than download speed on most Australian NBN plans (for example, an NBN 100 plan offers 100 Mbps download but only 20 Mbps upload). This asymmetry affects businesses that regularly transfer large files, host servers, or have many staff in simultaneous video calls. NBN FTTP plans increasingly offer symmetrical speeds (equal upload and download) at higher tiers. See also: Download, Bandwidth, Cloud Backup.
UPS (Uninterruptible Power Supply)
A UPS keeps your computer and networking equipment running for several minutes after a mains power failure, providing time to save work and shut down safely. UPS devices also continuously filter power, protecting equipment from surges, spikes, sags, and electrical noise that can damage components over time. For businesses, UPS units protect servers, firewall appliances, VoIP phone systems, and network switches – ensuring internet and communications remain operational through brief outages. UPS capacity is rated in VA (volt-amperes) or watts. Common UPS types: Standby/offline (switches to battery on power failure – cheapest); Line-interactive (also corrects voltage fluctuations without switching to battery – recommended for most computers); Online/double-conversion (always runs from battery, providing the purest power – used for critical server equipment). See also: PSU, Surge Protector, Cloud Backup.
UPS – See: Uninterruptible Power Supply (UPS)
UPS Types – Topology
UPS (Uninterruptible Power Supply) units use different internal designs (topologies) with varying levels of protection: Offline / Standby UPS – the cheapest type; normally passes mains power directly through; only switches to battery when mains power fails (slight transfer delay of 2–10ms); basic surge protection; suitable for home computers. Line-Interactive UPS – adds automatic voltage regulation (AVR) that corrects voltage sags and surges without switching to battery; faster transfer time; most popular for home offices, small businesses, and networking equipment; brands like APC Back-UPS and CyberPower. Online / Double-Conversion UPS – the highest protection; continuously converts mains AC power to DC, then back to clean AC, so the connected equipment always runs on battery-regulated power; zero transfer time; eliminates all power quality issues; used for servers, data centres, medical equipment, and critical infrastructure. See also: UPS, Battery Backup, Surge Protector.
USB (Universal Serial Bus)
USB is the world’s most common standard for connecting peripherals and transferring data. USB specifications: USB 2.0 – 480 Mbps, still common for keyboards, mice, and low-speed peripherals; USB 3.2 Gen 1 (USB 3.0) – 5 Gbps, blue-coloured ports; USB 3.2 Gen 2 – 10 Gbps; USB 3.2 Gen 2×2 – 20 Gbps; USB 4 – 40 Gbps, uses USB-C; Thunderbolt 4/5 – 40–120 Gbps, uses USB-C. Connector types: USB-A (the classic rectangular connector); USB-B (square, found on printers and old devices); Mini-USB and Micro-USB (older small devices); USB-C (modern small, reversible connector). A USB hub expands one USB port into multiple ports. See also: Thunderbolt / USB-C, Peripheral.
USB Flash Drive / Thumb Drive / Memory Stick
A USB flash drive (also called a thumb drive, memory stick, or USB stick) is a small, portable data storage device that plugs into a USB port. They use flash memory (the same technology as SSDs) and require no external power. Common uses: transferring files between computers; carrying important documents and presentations; emergency bootable operating system drives; and quick temporary backup of small amounts of data. Capacities range from 8GB to 2TB; prices are very affordable (under $20 AUD for most everyday capacities). For regular portability of sensitive data, use an encrypted USB drive (hardware-encrypted drives like IronKey are available). Always safely eject a USB drive before removing it (right-click the drive in File Explorer > Eject) to prevent data corruption. See also: USB, Data Recovery, Encryption.
USB Hub
A USB hub is a device that expands a single USB port into multiple ports, allowing you to connect more USB devices than your computer has ports for. Passive (bus-powered) hubs draw power from the computer’s USB port and are suitable for low-power devices like keyboards, mice, and flash drives. Active (powered) hubs have their own power supply and can supply full power to multiple high-power devices (external hard drives, charging phones). USB-C hubs and multiport adapters are particularly popular for modern laptops with limited port selection. Look for hubs that match your USB version requirements (USB 3.0/3.2 for fast data transfer with external drives). See also: USB, Docking Station, Thunderbolt / USB-C.
User Account
A user account is a profile that identifies an individual to a computer system, determining what resources and settings they can access. In Windows, account types include: Administrator (full system control; can install software and change system settings); Standard User (limited access; recommended for daily use even on personal computers, as it reduces malware impact); and Guest (very limited temporary access). For families, Microsoft Family Safety allows creating children’s accounts with age-appropriate restrictions. For businesses using Microsoft 365 / Azure Active Directory, user accounts are managed centrally and linked to email, SharePoint, Teams, and other services. Using standard user accounts for daily computing is an important security practice – malware running under a standard account has limited ability to cause system-wide damage. See also: OS (Operating System), Cybersecurity, Multi-Factor Authentication (MFA).
Variable, Function, and Loop (Programming Basics)
Three fundamental building blocks of virtually all programming: Variable – a named storage location in memory that holds a value which can change during program execution. Like a labelled box: age = 30. Function (also called a method or procedure) – a reusable block of code that performs a specific task and can be called multiple times from different parts of a program. Functions take input (parameters), process it, and return output. Loop – a structure that repeats a block of code multiple times. A for loop repeats a set number of times; a while loop repeats as long as a condition is true. These three concepts, combined with conditional statements (if/else), form the basis of all programming logic. See also: Algorithm, Programming Language, Bug / Debugging.
VESA Mount
VESA (Video Electronics Standards Association) mount refers to a standardised pattern of four screw holes on the back of monitors and TVs used to attach monitor arms, wall brackets, and mounting systems. The most common patterns are 75×75mm (smaller monitors) and 100×100mm (most monitors and small TVs). Larger TVs use 200×200mm or 400×400mm patterns. Before buying a monitor arm or wall bracket, check your monitor’s VESA pattern in its specifications. Some ultra-thin monitors use proprietary mounting systems without standard VESA holes; compatible VESA adapters are available for some models. See also: Monitor Arm, Monitor.
Video Conferencing
Video conferencing is the real-time transmission of audio and video between two or more participants at different locations over the internet, enabling face-to-face meetings without physical travel. Since the COVID-19 pandemic, video conferencing has become central to Australian business operations. Major platforms: Zoom – most widely adopted, excellent cross-platform support; Microsoft Teams – deeply integrated with Microsoft 365, dominant in enterprise; Google Meet – integrated with Google Workspace; Cisco Webex – enterprise-grade; FaceTime – Apple-to-Apple calls. Key requirements for good video calls: stable internet with adequate upload speed (3–5 Mbps minimum, 10+ Mbps for HD); a quality webcam (720p minimum, 1080p preferred); good microphone or headset (to reduce background noise); and good lighting. See also: VoIP, Webcam, Headphones / Headset, Bandwidth.
Video Editing Software
Video editing software allows you to cut, arrange, colour grade, add music, and produce polished video content from raw footage. Options for every level: Free / beginner: iMovie (Mac, iOS – excellent for beginners; exports to Final Cut Pro); CapCut (mobile-first, excellent for social media content, AI features); creative workstation setup and GPU upgrades (professional-grade software with a free version that is more capable than many paid tools). Paid / professional: Adobe Premiere Pro (industry standard for broadcast and film); Final Cut Pro (Mac only; one-time purchase; extremely fast on Apple Silicon); DaVinci Resolve Studio (advanced colour grading and audio; one-time purchase); Avid Media Composer (broadcast/film industry). Key concepts: timeline editing (arranging clips in sequence); transitions; colour correction and grading; audio mixing; titles and effects; and export settings (codec, resolution, frame rate, bitrate for the intended platform – YouTube, Instagram, broadcast). For Australian content creators, DaVinci Resolve’s free version is the outstanding value choice. See also: Codec, Bitrate, 4K / 8K Resolution, GPU.
VDI (Virtual Desktop Infrastructure)
Virtual Desktop Infrastructure hosts desktop environments (the full Windows or Linux desktop) on centralised servers in a data centre, delivered to users’ devices over the network. Instead of running Windows locally on each employee’s laptop, the laptop becomes a thin client that streams a virtual desktop from a powerful server. Benefits: Centralised management – updates, patches, and software deployed once; Security – data never leaves the server (important for sensitive industries); Flexibility – access your full desktop from any device, anywhere; Longevity – cheap endpoint devices last longer since processing is remote. Use cases: call centres; financial services firms with strict data governance; healthcare; education (BYOD computer labs). Platforms: VMware Horizon; Citrix Virtual Apps and Desktops; Microsoft Azure Virtual Desktop (formerly Windows Virtual Desktop). Modern cloud-based VDI (DaaS – Desktop as a Service) eliminates the need for on-premises servers. See also: Thin Client, Remote Desktop, Virtualisation, Cloud Computing.
Virtual Memory / Page File
Virtual memory is a memory management technique that extends the apparent amount of RAM available to programs by using a portion of the storage drive (HDD or SSD) as overflow memory. When physical RAM fills up, the operating system moves the least-recently-used data from RAM to a file on disk called the page file (Windows) or swap space (Linux/macOS). When that data is needed again, it is moved back (“paged in”) from disk to RAM. Virtual memory prevents programs from crashing when RAM is full, but performance degrades significantly when paging occurs because disk access is much slower than RAM. Excessive paging (disk thrashing) causes severe slowdowns and is a primary symptom of insufficient RAM. On SSDs, paging performance is much better than on HDDs. RAM upgrade service to chronic paging. See also: RAM, SSD, OS.
Virtualisation
Virtualisation is the technology of creating virtual (software-based) versions of computing resources – including servers, operating systems, storage, and networks – that run on physical hardware. A hypervisor is the software layer that manages virtual machines (VMs), allocating physical CPU, RAM, and storage resources between them. A single physical server might run 10–50 VMs simultaneously. Types: Type 1 (bare-metal) hypervisor – runs directly on hardware (VMware ESXi, Microsoft Hyper-V, Proxmox); Type 2 (hosted) hypervisor – runs as an application on an OS (VMware Workstation, VirtualBox, Parallels on Mac). Virtualisation is foundational to cloud computing, allowing cloud providers to slice physical servers into thousands of smaller virtual instances. Desktop virtualisation allows running Windows inside macOS, or testing software in an isolated VM. See also: Cloud Computing, Containerisation / Docker, Server, Green IT.
Virus
A computer virus is a type of malware that self-replicates by inserting copies of itself into other programs, files, or the boot sector of a storage device. When an infected file is executed, the virus activates and can spread to other files and networked computers. Viruses range from mildly annoying (displaying messages) to severely destructive (corrupting or deleting files, permanently damaging hardware in rare cases). Unlike worms, viruses require user action to spread (opening an infected file or running an infected program). Modern “polymorphic” viruses change their code to evade antivirus detection. Protection requires professional virus removal service, regular Windows Updates, and caution with email attachments and software downloads. See also: Malware, Worm, Trojan Horse, Ransomware.
Virus Warning Pop-ups – What to Do
A very common source of confusion for computer users: if you see a pop-up message on your screen – whether in your browser, on your desktop, or as a system notification – claiming your computer is infected with viruses, that your data has been stolen, or that you need to call a phone number immediately, this is almost certainly a scam. Legitimate antivirus software (Windows Defender, Norton, etc.) does not display phone numbers or instruct you to call anyone. Legitimate Microsoft, Apple, or Telstra security warnings never include a phone number. The correct response: close the pop-up (Alt+F4), close the browser, or restart the computer. Do not call the number, do not grant remote access to anyone who calls you. Report the scam to Scamwatch (scamwatch.gov.au). See also: Tech Support Scam, Pop-up, Malware, Cybersecurity.
VLAN (Virtual Local Area Network)
A VLAN is a logical segmentation of a physical network that groups devices together as if they were on the same local network, even if they are physically distributed across different switches or locations. VLANs are created in software on managed network switches. Common uses: separating staff computers from guest Wi-Fi (preventing guests from accessing internal resources); isolating IoT devices (smart cameras, printers) from computers on the same physical network; separating different departments’ networks (finance, HR, engineering) for security; and reducing broadcast traffic. VLANs are professional network security setup and are configured on managed switches and enterprise routers. Home users with consumer-grade routers can approximate VLAN isolation using separate SSIDs and guest network features. See also: Network Switch, Firewall, Zero Trust Security, IoT.
Voice Assistant / Smart Speaker
A voice assistant is an AI-powered software agent that responds to voice commands to perform tasks, answer questions, control smart home devices, set reminders, play music, and more. Major voice assistants include: Amazon Alexa (Amazon Echo devices); Google Assistant / Google Home (Nest speakers and displays); Apple Siri (iPhone, iPad, Mac, HomePod); Microsoft Cortana (Windows, largely deprecated); and Samsung Bixby (Galaxy devices). Smart speakers are standalone devices with built-in microphones, speakers, and a voice assistant. Privacy consideration: smart speakers have always-on microphones listening for their wake word (“Hey Siri,” “OK Google,” “Alexa”) – a concern for privacy-conscious users. Most devices allow reviewing and deleting voice recordings in their companion apps. See also: IoT, Smart Home, Artificial Intelligence.
VoIP (Voice over Internet Protocol)
VoIP allows making phone calls over the internet rather than traditional phone lines, typically at much lower cost for local and international calls. VoIP converts voice audio into digital data packets transmitted over the internet, then converted back to audio at the destination. Consumer VoIP services include Skype, WhatsApp calls, Facetime, Zoom, and Microsoft Teams. Business VoIP platforms include professional VoIP and internet setup (widely used by Australian SMBs), RingCentral, Vonage, and Microsoft Teams with Direct Routing. VoIP call quality depends heavily on internet connection stability and latency – a minimum of 1–2 Mbps per call and latency under 150ms is required for good quality. VoIP services in Australia must now be capable of making emergency (000) calls, though reliability during power and internet outages remains a consideration. See also: Broadband, NBN, Latency, Protocol.
VoIP Codecs / Call Quality
Voice over IP call quality depends heavily on the codec (encoder-decoder) used to compress and transmit voice audio. Common VoIP codecs and their characteristics: G.711 (PCMU/PCMA) – uncompressed audio; highest quality; uses 64 Kbps bandwidth; the gold standard when bandwidth is not a constraint; used on most business VoIP systems. G.722 – HD voice (wideband); twice the frequency range of G.711; voice sounds noticeably clearer and more natural; supported by most modern VoIP handsets and 3CX; requires 64 Kbps. G.729 – compressed; good quality at only 8 Kbps; ideal for low-bandwidth connections; slight quality reduction vs G.711. Opus – the modern internet standard; variable bitrate; excellent quality from 6–510 Kbps; used by Zoom, Teams, Discord, and WebRTC applications. Call quality problems (jitter, echo, dropped packets) are often caused by insufficient QoS configuration. See also: VoIP, QoS, Codec, Latency.
Von Neumann Architecture
The Von Neumann architecture (named after mathematician John von Neumann) is the foundational computer design model that almost all modern computers follow. Its key principle is that both program instructions and data are stored in the same memory (RAM), and are accessed by a single processor that fetches, decodes, and executes instructions sequentially. The architecture has four main components: CPU (processes instructions); Memory (stores both program and data); Input/Output devices; and a bus connecting them. The Von Neumann bottleneck – the limited bandwidth between CPU and memory – is a fundamental performance constraint that hardware designers have worked around for decades using caches, parallelism, and memory bandwidth improvements. Alternative architectures like Harvard (separate instruction and data memory, used in many microcontrollers) and neuromorphic computing address some limitations. See also: CPU, RAM, Cache.
VPN (Virtual Private Network)
A VPN creates an encrypted tunnel between your device and a VPN server, routing your internet traffic through that server. Main uses: Privacy and security – your traffic is encrypted and your real IP address is hidden from websites, advertisers, and your ISP; particularly important when using public Wi-Fi where attackers could intercept traffic; Remote access – businesses use corporate VPNs (Cisco AnyConnect, Fortinet SSL VPN, WireGuard) to allow staff to securely access internal company systems from home or while travelling; Bypassing geo-restrictions – accessing streaming content or services unavailable in Australia. VPN protocols include OpenVPN, WireGuard (modern, fast), IKEv2, and L2TP/IPSec. Popular consumer VPNs include NordVPN, ExpressVPN, Mullvad, and ProtonVPN. Important: a VPN does not make you anonymous, cannot protect against phishing or malware, and slows your connection slightly. See also: Encryption, Cybersecurity, Firewall, Remote Desktop.
VPN Types (Site-to-Site vs Remote Access)
VPNs come in two fundamentally different configurations for different use cases: Remote Access VPN – allows individual users to connect securely to a corporate network from anywhere over the internet, as if they were physically in the office. Each user runs VPN client software (Cisco AnyConnect, GlobalProtect, WireGuard, OpenVPN) that establishes an encrypted tunnel to the company’s VPN gateway. Essential for remote desktop and VPN support, file shares, or business applications. Site-to-Site VPN – connects two or more entire networks together over the internet permanently (e.g., connecting a Sydney office network to a Melbourne office network), allowing computers on both networks to communicate as if on the same LAN. Common protocols: IKEv2/IPSec (most common for site-to-site), WireGuard (newer, faster, simpler), SSL/TLS VPN (works through web browsers). See also: VPN, Encryption, Remote Desktop, Firewall.
VPN Leak / DNS Leak
A VPN should route all your internet traffic through an encrypted tunnel, hiding your real IP address and DNS queries. A VPN leak occurs when some traffic bypasses the VPN tunnel and reaches the internet directly, exposing your real IP address or browsing activity. Types of leaks: DNS leak – your DNS queries go to your ISP’s DNS servers instead of through the VPN (revealing every website you visit); IP leak – your real IP address is exposed alongside the VPN IP; WebRTC leak – browser WebRTC protocols can reveal your real IP even when a VPN is active (common in Chrome and Firefox). Tools like dnsleaktest.com and ipleak.net can check for leaks. A good VPN provider with a kill switch (which cuts all internet if the VPN connection drops) prevents most leaks. See also: VPN, DNS, Private Browsing, Browser Fingerprinting.
VPN Protocols (WireGuard / OpenVPN / IKEv2)
Different VPN protocols offer varying trade-offs in speed, security, and compatibility: WireGuard – the newest and best overall choice for most uses; extremely fast (minimal CPU overhead); small codebase (4,000 lines vs OpenVPN’s 400,000+) making security auditing easier; uses state-of-the-art cryptography; increasingly the default for consumer VPN services (NordVPN, Mullvad, ProtonVPN). OpenVPN – the long-time open-source standard; highly configurable; excellent security; slower than WireGuard; widely compatible; TCP mode can penetrate restrictive firewalls. IKEv2/IPSec – fast; handles network changes well (good for mobile devices switching between Wi-Fi and cellular); native support in Windows, macOS, iOS. L2TP/IPSec – older; some concerns about NSA compromise; avoid if alternatives are available. PPTP – obsolete; broken encryption; never use. SSTP – Microsoft’s protocol using SSL/TLS; works through most firewalls; Windows-centric. For most users: professional VPN and network setup, then IKEv2, then OpenVPN. See also: VPN, Encryption, SSH.
VR Headset / Spatial Computing Device
A VR headset is the hardware worn on the head to experience virtual reality – replacing or augmenting visual reality with a stereoscopic digital display positioned close to the eyes. Key specifications: Resolution – per-eye resolution (the higher the better for clarity and reducing the “screen door effect”); Field of View (FoV) – how much of your vision is covered; Refresh rate – 90Hz minimum for comfort, 120Hz+ preferred; Tracking – inside-out (cameras on the headset) or outside-in (external base stations). Current notable headsets: Meta Quest 3 (standalone, no PC required, mixed reality capable); Apple Vision Pro (spatial computing, premium, not primarily a gaming device); PlayStation VR2 (requires PS5); Valve Index (PC VR, high-end). Motion sickness (sim sickness) is a challenge for many users, caused by mismatch between visual motion and physical stillness. See also: Augmented Reality (AR) and Virtual Reality (VR), GPU, Metaverse.
WAF (Web Application Firewall)
A Web Application Firewall monitors, filters, and blocks HTTP/HTTPS traffic to and from a web application, protecting against web-specific attacks that a regular network firewall cannot detect. Common threats a WAF protects against: SQL Injection (attackers inserting malicious database queries into web forms); Cross-Site Scripting (XSS) (injecting malicious scripts into pages viewed by other users); DDoS attacks (overwhelming a website with traffic to take it offline); Bot attacks (automated scraping, credential stuffing, and fraud). Popular WAF services include Cloudflare WAF, AWS WAF, Sucuri, and Imperva. For businesses running websites or web applications handling customer data or payments, a WAF is an important security layer. See also: Firewall, Cybersecurity, HTTPS.
Wake-on-LAN (WoL)
Wake-on-LAN is a networking standard that allows a computer to be powered on remotely by sending a special network packet (called a “magic packet”) to its MAC address, even when the computer is powered off (but still has standby power). This is useful for: IT administrators who need to remotely access computers that may have been left off; energy-saving setups where computers can be turned off but started on demand; remote desktop access when you left your computer at home. Requirements: the computer’s BIOS/UEFI must have Wake-on-LAN enabled (under Power Management settings); the network interface card must support WoL; the computer must be connected via wired Ethernet (Wi-Fi Wake-on-LAN is less reliable). Sending the magic packet: many router management interfaces include a WoL feature; third-party apps like Depicus Wake On Lan and mobile apps can send magic packets. Over the internet (WAN), Wake-on-LAN requires port forwarding or a VPN to the local network. See also: Remote Desktop, Ethernet, Router.
WAN (Wide Area Network)
A Wide Area Network is a network that spans a large geographic area – a city, country, or the globe. The internet itself is the world’s largest WAN. In business contexts, WAN refers to private network connections linking an organisation’s offices, branches, and data centres across cities or countries. WAN technologies include: MPLS (Multiprotocol Label Switching) – a private, high-reliability, low-latency WAN service provided by telcos (traditionally expensive); professional WAN and SD-WAN setup (see separate entry); leased lines (dedicated point-to-point connections); VPN over internet (using encrypted tunnels over public internet for lower cost); and SASE (Secure Access Service Edge) – a modern cloud-based approach combining networking and security. As cloud adoption grows, the distinction between corporate WAN and internet access blurs significantly. See also: LAN, SD-WAN, VPN, Network.
Water Damage Repair (Computers and Phones)
Liquid damage is one of the most common causes of device failure and one of the most recoverable – if handled correctly. Immediate action is critical: power off the device immediately (do not attempt to turn it on); remove the battery if possible (older phones/laptops); do not charge it; do not use a hair dryer (heat damages components further); remove any SIM cards, memory cards, and accessories. What actually damages electronics: water itself doesn’t destroy circuits; it enables electrical short circuits when power is present and causes corrosion over time. A powered device in contact with water short-circuits; an unpowered device in water may survive if dried properly before powering on. Drying methods: professional ultrasonic cleaning (the best method – removes all liquid and contamination from the logic board); silica gel desiccant (better than rice, which has minimal desiccant effect); 24–72 hours minimum drying time before attempting to power on. Rice myth: rice does not effectively dry the inside of devices and can introduce starch dust. For best outcomes, bring a water-damaged device to a professional as quickly as possible without attempting to turn it on. See also: Logic Board Repair, Data Recovery, Laptop Repairs.
Wear Leveling (SSD)
NAND flash cells in an SSD have a finite number of write/erase cycles before they wear out (typically 1,000–100,000 cycles depending on the flash type: QLC < TLC < MLC < SLC). If the same cells were written to repeatedly, they would wear out quickly while others remained fresh. Wear leveling is an algorithm run by the SSD's controller that distributes write operations evenly across all available flash cells, maximising the useful lifespan of the drive. Dynamic wear leveling distributes only new writes across free blocks. Static wear leveling also periodically moves cold data (rarely changed files) so that those blocks can also be used for new writes. Wear leveling, combined with over-provisioning (reserving a portion of flash capacity for controller use) and bad block management, is why modern SSDs can last many years of typical consumer use despite the inherent cell wear limitation. See also: SSD, NVMe SSD, TRIM, SMART Data.
Wearable Technology
Wearable technology refers to electronic devices worn on the body that integrate computing, health sensors, and wireless connectivity. Categories include: Smartwatches (Apple Watch, Samsung Galaxy Watch, Garmin Fenix) – health tracking, notifications, payments, GPS navigation; Fitness trackers (Fitbit, WHOOP, Polar) – focused on sleep, heart rate, and exercise tracking; Smart rings (Oura Ring, Samsung Galaxy Ring) – discreet health monitoring worn on a finger; Smart glasses (Ray-Ban Meta, Apple Vision Pro as a headset) – AR, calls, photos/video; Hearables (AirPods with health sensing, Bose with heart rate monitoring) – audio with biometric capability; Medical wearables – CGM (continuous glucose monitors for diabetics), ECG patches, blood pressure monitors. Health data from wearables is increasingly used by insurance companies, sports organisations, and healthcare providers. See also: Bluetooth, IoT, Biometrics.
Web Analytics
Web analytics is the measurement, collection, analysis, and reporting of website data to understand and optimise web usage. Key metrics: Sessions / Visits – number of separate visits to the website; Unique Users – distinct individuals who visited; Page Views – total pages loaded; Bounce Rate – percentage of sessions where the visitor left after viewing only one page; Average Session Duration – how long visitors spend on the site; Conversion Rate – percentage of visitors who complete a desired action (purchase, contact form, booking); Traffic Sources – organic search, paid ads, social media, direct, referral. Google Analytics 4 (GA4) is the dominant web analytics platform. Matomo is a privacy-focused open-source alternative. Analytics data drives informed decisions about content, UX design, marketing investment, and technical improvements. See also: SEO, Cookie, Web Hosting, Tracking Pixel.
Web App / Progressive Web App (PWA)
A web app is an application that runs in a web browser rather than being installed locally on your device. Unlike a traditional website (primarily informational), a web app is interactive and provides functionality similar to desktop software – email clients (Gmail), productivity tools (Google Docs), project management (Trello, Notion), and design tools (Canva) are all web apps. Progressive Web Apps (PWAs) are web apps enhanced with modern browser APIs to behave more like native apps: they can work offline (using cached data), receive push notifications, appear on the home screen (installed from the browser), and access device hardware. PWAs bridge the gap between websites and native apps. Microsoft 365 setup and support and Twitter’s mobile experience are examples of PWAs. See also: Browser, SaaS, API, Cloud Computing.
Web Hosting
Web hosting is the service of providing server infrastructure, storage, and connectivity to make websites and web applications accessible on the internet. Types of hosting: Shared hosting – multiple websites share one server’s resources; the most affordable option, suitable for small websites; VPS (Virtual Private Server) – a virtual machine with dedicated allocated resources; better performance and control than shared hosting; Dedicated server – an entire physical server exclusively for one customer; highest performance and control; Cloud hosting – resources distributed across multiple servers for scalability and reliability (AWS, Azure, Google Cloud); Managed WordPress hosting – optimised specifically for WordPress websites (WP Engine, Kinsta, Flywheel). Hosting choice affects website speed, reliability, security, and scalability. Australian businesses should consider local Australian-based hosting (e.g., Hostinger AU, VentraIP, SiteGround) for lower latency to Australian visitors and compliance with Australian data residency requirements. See also: Domain Name, Cloud Computing, Server.
Webcam
A webcam is a camera connected to a computer (built-in or external) used for video calls, video conferencing, live streaming, and video recording. Built-in webcams on laptops and all-in-ones typically offer 720p or 1080p resolution. For better quality video calls and streaming, an external USB webcam is recommended. Popular brands include Logitech (C920, C922, Brio 4K), Razer, Elgato, and Anker. Key specifications: resolution (1080p minimum, 4K for high quality streaming); field of view (wide angle for showing the desk area); frame rate (30fps standard, 60fps for smoother video); low-light performance; built-in microphone quality; and autofocus. computer and peripheral setup service, a DSLR or mirrorless camera connected via HDMI capture card produces far superior image quality. See also: USB, VoIP, Streaming.
Webhook / API Automation
A webhook is a mechanism that allows one application to automatically notify another when a specific event occurs, by sending data to a specified URL the moment the event happens – rather than the receiving app repeatedly asking “has anything changed?” (polling). Webhooks are used extensively in automation: when a customer places an order in Shopify, a webhook fires to update the inventory system; when a payment is received via Stripe, a webhook triggers an invoice email; when code is pushed to a GitHub repository, a webhook starts a deployment pipeline. Tools like Zapier, Make (formerly Integromat), and n8n use webhooks to connect thousands of apps. Understanding webhooks is important for anyone building or managing software integrations. See also: API, SaaS, Cloud Computing.
Website Builder
A website builder is a tool that allows creating a website without coding knowledge, using visual drag-and-drop interfaces and pre-designed templates. Hosted website builders (all-in-one): Squarespace – premium templates, excellent design quality, popular for portfolios and small businesses; Wix – very easy to use, extremely flexible, large app marketplace; Webflow – design-focused, produces clean code, popular with designers who want visual control without full coding; Weebly (owned by Square) – simple, integrates with Square payments. Self-hosted CMS: WordPress.org (requires hosting, more technical, most flexible, 43% of the web uses it – covered separately). Choosing: for simplicity and design quality, Squarespace; for flexibility and features, Wix; website and IT support services. Key considerations: custom domain support, SEO features, mobile responsiveness, e-commerce capability, and ongoing monthly costs. See also: CMS, Web Hosting, Domain Name, SEO.
WhatsApp / Signal / Secure Messaging Security
Securing your WhatsApp account is particularly important as it is commonly used for sensitive personal and business communication: WhatsApp Two-Step Verification: Settings > Account > Two-step verification; adds a 6-digit PIN required when registering your phone number on a new device; prevents SIM swap attacks from immediately gaining access. WhatsApp Web session management: Settings > Linked Devices; review and remove any unfamiliar linked devices – if your number was compromised, check for unknown linked devices immediately. Privacy settings: Settings > Privacy – control who sees your profile photo, Last Seen, and Status; consider “My Contacts” rather than “Everyone.” Backup encryption: WhatsApp backups to Google Drive or iCloud are encrypted; enable end-to-end encrypted backup (Settings > Chats > Chat Backup > End-to-end encrypted backup) to ensure even Google/Apple cannot access them. Disappearing messages: can be set to delete automatically after 24 hours, 7 days, or 90 days. For maximum security, use Signal (open-source, no metadata collection, superior security architecture). See also: iMessage Security, Encryption, SIM Swapping, Multi-Factor Authentication.
Wi-Fi 6 / Wi-Fi 6E / Wi-Fi 7
Wi-Fi standards, defined by the IEEE 802.11 working group, have evolved dramatically: Wi-Fi 4 (802.11n) – still found in many older devices; up to 300 Mbps; 2.4/5 GHz; Wi-Fi 5 (802.11ac) – up to 3.5 Gbps; 5 GHz; still widely deployed; Wi-Fi 6 (802.11ax) – up to 9.6 Gbps; 2.4 and 5 GHz; better performance in dense environments (many devices connecting simultaneously); improved battery efficiency for IoT devices (Target Wake Time); Wi-Fi 6E – adds the 6 GHz band, providing more channels, less interference, and lower latency; Wi-Fi 7 (802.11be) – released 2024; up to 46 Gbps theoretical; Multi-Link Operation (MLO) uses multiple bands simultaneously; 320 MHz channels; dramatically better performance in congested environments. For most Australian homes, a Wi-Fi 6 or 6E router represents the optimal price-performance choice. See also: Router, Mesh Network, Bandwidth.
Wi-Fi Password / Network Key
Your Wi-Fi password (also called the wireless network key or WPA key) is the password required to connect a device to your wireless network. It is different from your router’s admin password (used to access router settings). The default Wi-Fi password for most home routers is printed on a sticker on the bottom or back of the router, alongside the network name (SSID). If you have changed your Wi-Fi password and forgotten it: on a Windows PC already connected, go to Control Panel > Network and Sharing Centre > click the Wi-Fi network name > Wireless Properties > Security tab > check “Show characters.” On a Mac, search Keychain Access. As a last resort, log into the router’s admin interface (usually at 192.168.0.1 or 192.168.1.1 in a browser) using the admin credentials. See also: Router, Wireless Network, Log In.
Wi-Fi Troubleshooting Guide
Systematic approach to diagnosing Wi-Fi problems: Step 1 – Identify scope: is it one device or all devices? If one device, the problem is with that device (forget and reconnect the network, update its Wi-Fi driver). If all devices, the problem is with your router/NBN. Step 2 – Power cycle: unplug your modem and router, wait 30 seconds, plug back in; wait 2 minutes for full reconnection. This resolves the majority of NBN/internet dropouts. Step 3 – Check the NBN Connection Device (NCD): look at the lights; all lights should be on and steady; flashing or amber lights indicate a connection problem; call your ISP if lights are wrong. Step 4 – Speed test: test wired (Ethernet cable directly from router to laptop) and wireless; if wired speed is good but Wi-Fi is slow, the problem is Wi-Fi; if both are slow, the problem is your NBN connection or ISP. Step 5 – Wi-Fi interference: try changing from 5GHz to 2.4GHz band or vice versa; check if neighbours’ Wi-Fi is on the same channel (use a Wi-Fi analyser app); microwave ovens, baby monitors, and Bluetooth devices can interfere with 2.4GHz. Step 6 – Router placement: central location; elevated position; away from walls, metal objects, and appliances. See also: Router, NBN, Wi-Fi 6 / 6E / 7, Mesh Network.
Window (Program Window)
In computing, a window is a rectangular area on screen that displays a running program or document. Windows can be: Maximised (fills the entire screen); Windowed/Restored (floating, resizable); or Minimised (hidden from view but still running, shown as a button on the taskbar). Window controls appear in the top-right corner of each window: ✕ (X) = Close; □ = Maximise/Restore; – = Minimise. You can resize a window by dragging its edges or corners. You can move a window by clicking and dragging its title bar. Windows 11’s Snap Layouts (hover over the maximise button) lets you quickly arrange windows side by side. Multiple open windows can be switched between using Alt+Tab. The term “Windows” (with a capital W) refers to Microsoft’s Windows operating system. See also: Desktop (UI), Taskbar, Keyboard Shortcuts.
Windows Versions Explained (Windows 10 / 11)
Microsoft Windows is the world’s most widely used desktop operating system. Understanding the version landscape helps you keep your computer secure and compatible: Windows 10 – released 2015; reached end of mainstream support October 2025 (Microsoft ended free security updates); more than 8 million Australian PCs still ran Windows 10 beyond this date, creating significant security risks. Windows upgrade and migration service to Windows 11 or enrol in Microsoft’s Extended Security Updates (ESU) paid programme. Windows 11 – released 2021; requires TPM 2.0 and Secure Boot; modern interface with revamped Start Menu, Snap Layouts, Microsoft Teams integration, and improved gaming features (DirectStorage, Auto HDR). Windows Editions: Home (standard consumer), Pro (business features including BitLocker, Remote Desktop server, Hyper-V, Group Policy), Enterprise, and Education. Always check which edition you have by going to Settings > System > About. See also: Windows Updates, TPM, Windows Defender, BitLocker, Windows 11 Upgrade.
Upgrading to Windows 11
Windows 11 has specific hardware requirements not met by many older PCs, particularly the TPM 2.0 requirement. How to check if your PC is compatible: download and run the PC Health Check app from Microsoft’s website – it gives a pass/fail result with specific reasons for failure. Minimum requirements: 64-bit CPU with 2+ cores at 1GHz or faster; 4GB RAM; 64GB storage; TPM 2.0; Secure Boot capable UEFI; DirectX 12 compatible GPU; and a display of at least 720p resolution. The most common upgrade blocker is TPM 2.0 – many PCs manufactured before 2016 lack it or have it disabled in BIOS. Some motherboards have TPM 2.0 but it needs to be enabled in UEFI settings (look for “TPM,” “PTT” for Intel, or “fTPM” for AMD). If your PC doesn’t meet requirements: Windows 11 upgrade service (RAM, adding an SSD), purchasing a new PC, or remaining on Windows 10 with Extended Security Updates. See also: TPM, BIOS / UEFI, Windows Versions, Windows Updates.
Windows Activation / Licence
Windows requires activation – verifying with Microsoft that your copy is genuine and licensed – to access all features and receive security updates. Windows activation is tied to your hardware (particularly the motherboard) or a Microsoft account. Types of licences: OEM licence – sold with a new computer by the manufacturer; tied to that specific hardware permanently; cheapest but cannot be transferred to a different computer. Retail licence – purchased separately; can be transferred to a new computer if removed from the old one. Volume licence – for organisations buying multiple copies; managed through Microsoft’s volume licensing portal. An unactivated Windows shows a watermark, blocks personalisation settings, and may eventually restrict functionality. Warning: “cheap” Windows keys sold on eBay, Gumtree, or grey market sites are frequently OEM keys obtained fraudulently or will be deactivated by Microsoft – legitimate Windows licensing assistance. See also: Operating System, Windows Updates.
Windows Backup / File History
Windows includes several built-in backup mechanisms: File History – continuously backs up files in your Libraries (Desktop, Documents, Pictures, Music, Videos) to an external drive or network location; keeps multiple versions so you can restore a file from any point in history; configured in Settings > Update & Security > Backup. Windows Backup (Settings > Accounts > Windows Backup in Windows 11) backs up settings, credentials, and files to OneDrive. System Image Backup – creates a complete snapshot of your entire Windows installation, settings, and files; can fully restore a computer to this exact state; found in Control Panel > Backup and Restore (Windows 7). Restore Points – lightweight snapshots of system files and registry created before Windows Updates and software installations; does not include personal files; accessible via System Restore. For comprehensive protection, professional backup setup and data recovery over relying solely on built-in tools. See also: Cloud Backup, Shadow Copy, System Restore.
Windows Defender / Microsoft Defender Antivirus
Windows Defender (officially Microsoft Defender Antivirus) is the built-in security solution included with every copy of Windows 10 and 11 at no extra cost. It provides: real-time malware protection (scanning files as they are accessed); scheduled and on-demand scanning; cloud-delivered protection (submitting suspicious files to Microsoft’s cloud for rapid analysis); ransomware protection (Controlled Folder Access – preventing unauthorised apps from modifying protected folders); and integration with Windows Security, the centralised security dashboard. Is Windows Defender good enough? Independent tests consistently rate it as excellent – AV-TEST and AV-Comparatives regularly award it top scores, and professional virus removal service comprehensive protection. Paid third-party antivirus (Norton, Bitdefender, Kaspersky, Eset) may add features like VPN, parental controls, and password management, but the core malware protection is comparable. Never run two antivirus programs simultaneously – they conflict and slow the system. See also: Malware, Ransomware, Virus, Windows Updates.
Windows Event Viewer / Event Logs
Windows Event Viewer is a built-in tool that records a detailed log of everything happening on your Windows system – application errors, security events, system warnings, and hardware issues. Access it by searching “Event Viewer” in the Start menu. Key log channels: Windows Logs > Application – errors and warnings from installed programs; Windows Logs > Security – all login attempts (successful and failed), privilege usage, and security-relevant actions (critical for detecting intrusions); Windows Logs > System – hardware errors, driver failures, service crashes; Windows Logs > Setup – installation activity. Event IDs to know: 4624 (successful logon), 4625 (failed logon – multiple failures indicate a brute force attempt), 4634 (logoff), 4720 (user account created), 7045 (new service installed – often malware persistence). IT professionals use event logs to diagnose crashes, professional security incident response, and prove evidence of unauthorised access. See also: Cybersecurity, Incident Response, Windows Security.
Windows Firewall / Windows Security
Windows Security (formerly Windows Defender Security Centre) is the built-in dashboard in Windows 10 and 11 that consolidates all security features in one place. Access it by searching “Windows Security” in the Start menu. Key sections: Virus & threat protection (Microsoft Defender Antivirus scans and history); Firewall & network protection (Windows Defender Firewall status for Domain, Private, and Public network profiles); App & browser control (SmartScreen settings for Edge and downloaded files); Device security (TPM and Secure Boot status); Device performance & health (Windows Update and storage health); and Family options (Microsoft Family Safety settings). The Windows Defender Firewall blocks unsolicited inbound connections and can be configured with rules. For most home users, the default settings provide adequate protection. Businesses should supplement with a hardware firewall. See also: Firewall, Windows Defender, Windows Updates.
Windows Hello
Windows Hello is Microsoft’s biometric authentication system built into Windows 10 and Windows 11, allowing users to sign into their PC using facial recognition (via an IR camera), fingerprint scan, or a PIN instead of a typed password. Windows Hello for Business extends this to enterprise environments, integrating with Azure Active Directory for passwordless corporate authentication. Windows Hello facial recognition uses an infrared camera and is significantly harder to spoof than a standard camera (it cannot be fooled by a photo). Windows Hello is also the basis for passkey support in Windows, enabling passwordless login to websites and applications using the device’s biometric hardware. See also: Biometrics, Multi-Factor Authentication (MFA), TPM, Cybersecurity.
Windows Hello / Windows PIN
Windows Hello is Microsoft’s biometric authentication system for Windows 10 and 11, allowing sign-in without a typed password using: Facial recognition (requires an IR camera – standard webcams cannot do this); Fingerprint (requires a fingerprint reader); or PIN. A Windows PIN is more secure than it sounds – unlike a regular password, a Windows Hello PIN is tied to the specific device through the TPM chip and never transmitted over the network. Even if someone learns your PIN, they cannot use it to log into your Microsoft account from another device. This device-binding is why Windows encourages PIN setup. Windows Hello also supports FIDO2 passkeys – passwordless sign-in to websites and apps using the Windows Hello biometric, providing phishing-resistant authentication. See also: Biometrics, Multi-Factor Authentication (MFA), TPM, Passkey.
Windows Registry
The Windows Registry is a hierarchical database that stores low-level configuration settings and options for the Windows operating system and installed applications. It contains: hardware configuration, user preferences, application settings, installed software information, startup programs, and system configuration. The Registry is organised into “hives” (HKEY_LOCAL_MACHINE, HKEY_CURRENT_USER, etc.) accessible via the Registry Editor (regedit.exe). Registry corruption can cause Windows startup failures, application errors, and system instability. Malware frequently modifies Registry entries to achieve persistence (auto-starting at boot). Warning: incorrectly editing the Registry can prevent Windows from starting. Always back up the Registry before making changes. Contrary to popular belief, “registry cleaners” typically provide minimal performance benefit and can occasionally cause harm – they are generally not recommended. See also: OS, Boot, Malware, Driver.
Windows Sandbox / Hyper-V
Windows Sandbox (Windows 10/11 Pro and Enterprise) is a lightweight isolated desktop environment where you can safely run untrusted applications or browse suspicious websites – anything run inside the Sandbox is completely isolated from your main system. When you close the Sandbox, everything inside is discarded permanently. No installation required for the sandboxed software – it’s a full temporary Windows installation. Ideal for safely testing downloads before running them on your main system. Hyper-V is Microsoft’s built-in virtualisation platform (Windows 10/11 Pro and Enterprise), allowing you to create and run full virtual machines (VMs) – other operating systems running simultaneously in isolated windows on your desktop. Commonly used for: running Linux alongside Windows, testing software in different OS versions, and IT labs. See also: Virtualisation, Containerisation / Docker, WSL, Safe Mode.
Windows Troubleshooters / Diagnostic Tools
Windows includes automated troubleshooters that diagnose and often fix common problems without needing technical expertise. Access via Settings > System > Troubleshoot > Other troubleshooters (Windows 11) or Settings > Update & Security > Troubleshoot (Windows 10). Built-in troubleshooters cover: Internet Connections; Windows Update (fixes failed updates); Printer; Playing Audio; Blue Screen; Bluetooth; Camera; and more. Other key diagnostic tools: sfc /scannow (System File Checker – run in Administrator Command Prompt to scan and repair corrupted Windows system files); DISM /Online /Cleanup-Image /RestoreHealth (repairs the Windows component store using Windows Update); chkdsk (Check Disk – scans and repairs file system errors on drives); and mdsched.exe (Windows Memory Diagnostic – tests RAM for errors, run overnight). These tools resolve a large proportion of common Windows problems professional computer repair and diagnostics. See also: BSOD, Crash, Windows Updates.
Windows Updates / Software Updates
Windows Update automatically downloads and installs security patches, bug fixes, driver updates, and feature improvements for Windows and Microsoft software. As Microsoft discovers new vulnerabilities, they release updates – some critical security patches are deployed on an emergency basis, while routine updates are typically released on “Patch Tuesday” (the second Tuesday of each month). professional virus removal service – unpatched Windows systems are a primary target for ransomware and malware. For businesses, update management tools like Windows Server Update Services (WSUS) or Microsoft Intune allow testing and staged deployment of updates across many computers. The principle applies equally to all software – browsers, Office applications, PDF readers, and third-party software all require regular updates to patch security vulnerabilities. See also: Cybersecurity, Ransomware, Virus, Driver.
Wireless Charging
Wireless charging (also called inductive charging) transfers electrical energy from a charging pad to a device through electromagnetic induction, without a physical cable connection. The most common standard is Qi (pronounced “chee”), developed by the Wireless Power Consortium and supported by virtually all modern Android phones and Apple iPhones (since iPhone 8). The newer Qi2 standard (developed with significant Apple involvement) adds a magnetic alignment system (similar to Apple MagSafe) for more efficient and faster charging. Wireless charging is slower than wired charging – standard Qi charges at 5–15W, while wired USB-C fast charging can exceed 100W. Despite being called “wireless,” a wireless charger still needs to be plugged into a power outlet. See also: USB, NFC, Wearable Technology.
Wireless Network
A wireless network (WLAN) connects devices using radio waves rather than physical cables, providing the flexibility to connect from anywhere within range. Modern wireless networks use Wi-Fi 5, 6, 6E, or 7 standards. Security is critical: fix your Wi-Fi security and connection issues on your Wi-Fi network (or WPA2 at minimum); use a strong, unique password; disable WPS (Wi-Fi Protected Setup) which has known vulnerabilities; and change the default router admin password immediately after setup. For business networks, a separate guest Wi-Fi network should be configured for visitors to prevent guest devices from accessing the internal corporate network. See also: Wi-Fi 6 / 6E / 7, Mesh Network, Router, Firewall.
WPA3 / Wi-Fi Security Standards
Wi-Fi Protected Access (WPA) is the security protocol used to encrypt traffic on Wi-Fi networks and prevent unauthorised access. The evolution of Wi-Fi security: WEP (Wired Equivalent Privacy) – the original standard from 1997; completely broken and insecure; should never be used. WPA (Wi-Fi Protected Access) – an interim improvement; still vulnerable. WPA2 – the standard from 2004, using AES encryption; widely used and considered secure for most home use, though vulnerable to offline dictionary attacks against weak passwords. WPA3 – the current standard (2018+), offering: stronger encryption (192-bit for enterprise); protection against offline password cracking (using SAE – Simultaneous Authentication of Equals); and forward secrecy (past sessions cannot be decrypted even if the password is later compromised). Ensure your router is configured for WPA3 or WPA2/WPA3 transition mode. See also: Router, Wireless Network, Encryption.
Worm (Computer Worm)
A computer worm is a type of malware that self-replicates and spreads across networks automatically, without requiring user interaction – unlike a virus which needs a user to execute an infected file. Worms exploit vulnerabilities in operating systems or network services to move from machine to machine. Once on a system, a worm can: consume bandwidth and system resources; install additional malware (ransomware, backdoors); delete files; and exfiltrate data. Notable historical worms include ILOVEYOU (2000), Conficker (2008), and WannaCry (2017, which also incorporated ransomware and affected hundreds of thousands of computers including the UK’s NHS). Worms can spread globally within hours. Defence: promptly professional virus and malware removal and software, segment networks to limit lateral movement, and monitor for unusual outbound network traffic. See also: Malware, Ransomware, Virus, Firewall.
Write Blocker
A write blocker (or forensic write blocker) is a hardware device or software solution that allows data to be read from a storage device while preventing any data from being written back to it. Write blockers are essential in data recovery and digital forensics to: preserve the original state of evidence drives (required for legal admissibility); prevent accidental modification of data on a drive being examined; and ensure that hash values calculated before and after examination remain identical (proving the drive was not altered). Hardware write blockers sit between the drive and the recovery workstation (e.g., Tableau, Wiebetech, and UltraKit devices). They connect drives via SATA, USB, or IDE interfaces and block all write commands at the hardware level, independent of any software. See also: Forensic Imaging, Chain of Custody, Data Recovery, Disk Image.
WSL (Windows Subsystem for Linux)
Windows Subsystem for Linux allows you to run a genuine Linux environment – command-line tools, utilities, and applications – directly within Windows 10 and 11, without a virtual machine or dual-boot setup. WSL 2 (the current version) runs a real Linux kernel in a lightweight virtual machine, providing full system call compatibility and dramatically improved performance. You can install Linux distributions (Ubuntu, Debian, Kali Linux, Fedora) from the Microsoft Store. Developers use WSL to: run Linux-native development tools and servers; use bash scripting; work with Docker and Kubernetes; run Python and Node.js with Linux compatibility; and access the Windows file system from Linux and vice versa. Kali Linux on WSL provides security researchers with penetration testing tools on a Windows machine. See also: Linux, Virtualisation, CLI / Terminal.
XR (Extended Reality)
Extended Reality (XR) is an umbrella term that encompasses all immersive technologies blending the real and virtual worlds: Virtual Reality (VR) – fully immersive synthetic environments; Augmented Reality (AR) – digital overlays on the real world; Mixed Reality (MR) – digital objects that interact with the physical environment; and all future combinations and gradations of these. The XR spectrum ranges from the completely real physical world at one end to fully virtual worlds at the other, with various degrees of digital augmentation in between. XR is increasingly being applied in: industrial training (surgeons practising procedures, miners learning equipment); retail (virtual try-ons); real estate (virtual property tours); education (immersive historical simulations); and therapy (treating phobias and PTSD). The XR market is projected to reach hundreds of billions of dollars by the end of the decade. See also: Augmented Reality (AR) and Virtual Reality (VR), Metaverse, GPU.
Zero-Day Vulnerability / Zero-Day Exploit
A zero-day vulnerability is a previously unknown security flaw in software or hardware that has not yet been patched by the vendor – meaning developers have had “zero days” to fix it. A zero-day exploit is a cyberattack that takes advantage of a zero-day vulnerability before a patch is available. Zero-days are extremely valuable to attackers because no defence exists yet. Nation-state actors and sophisticated criminal groups pay millions of dollars on black markets for undisclosed zero-days in popular software (Windows, iOS, Chrome, Office). When a zero-day is publicly disclosed or a patch released, users must update immediately as exploitation typically begins within hours. See also: Cybersecurity, Windows Updates, Penetration Testing.
Zero Trust Security
Zero Trust is a modern cybersecurity framework built on the principle of “never trust, always verify” – meaning no user, device, or application is trusted by default, even if already inside the corporate network. Traditional security assumed everything inside the network perimeter was safe; Zero Trust treats every access request as potentially hostile until verified. Core principles: verify every user identity (MFA); verify every device (is it compliant, up-to-date, and authorised?); apply least-privilege access (only grant the minimum access needed); micro-segment the network (limit lateral movement if a device is compromised); and monitor and log everything continuously. Zero Trust is now the recommended framework for organisations of all sizes, particularly with remote work and cloud services dissolving the traditional network perimeter. See also: Cybersecurity, our business IT security services (MFA), VPN, Firewall, Supply Chain Attack.
This is the most comprehensive computer and technology glossary available – over 618 terms covering everyday basics, Windows and Mac tips, mobile security, common scams, AI tools, cloud computing, hardware, data recovery, networking, Australian digital services, programming, gaming, and much more. For a full encyclopaedic listing visit https://www.wikipedia.org/
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