Tech Terms Everyone Pretends to Understand: 40 Simple Definitions

Tech is full of acronyms everyone nods along to and quietly doesn't understand. Here's a plain-English glossary of 40 common terms — the ones that show up in product pages, news, and settings — each in a sentence or two. Bookmark it.

AI and software

• AI (Artificial Intelligence): Software that performs tasks that normally need human intelligence, like understanding language or recognizing images.
• Machine Learning: A type of AI that learns patterns from data instead of being explicitly programmed.
• LLM (Large Language Model): The kind of AI behind chatbots, trained on huge amounts of text to generate and understand language.
• Generative AI: AI that creates new content — text, images, audio, video.
• AI Agent: AI that doesn't just answer but takes actions and completes multi-step tasks for you.
• Prompt: The instruction or question you give an AI.
• Hallucination: When an AI confidently states something false.
• Algorithm: A set of steps a program follows to solve a problem or make a decision.
• Open source: Software whose code is public and free to use, modify, and self-host.
• API: A way for one piece of software to talk to another.

Hardware and chips

• CPU: The main processor — the general-purpose "brain" of a device.
• GPU: A chip specialized for graphics and heavy parallel work, including gaming and AI training.
• NPU: A chip built to run AI tasks efficiently at low power; the "AI" in AI PCs.
• RAM: Short-term memory; more RAM means smoother multitasking.
• SSD: Fast storage with no moving parts; the biggest real-world speed upgrade for a computer.
• eSIM: A digital SIM built into your phone, handy for travel and dual numbers.
• UWB: Ultra-wideband; precise location tech behind device finding and hands-free unlocking.
• Chipset: The collection of chips that runs a phone or computer.

Internet and connectivity

• Wi-Fi 6 / 6E / 7: Successive Wi-Fi generations; newer ones add speed, capacity, and lower latency.
• Bandwidth: How much data your connection can move at once.
• Latency: Delay — how long data takes to make a round trip; lower is better for gaming and calls.
• Mesh network: Multiple units working together to blanket a home in Wi-Fi.
• VPN: A service that encrypts your internet traffic and hides your location/IP.
• Bluetooth: Short-range wireless for earbuds, keyboards, and nearby devices.
• Router: The device that connects your home to the internet and broadcasts Wi-Fi.

Security and privacy

• 2FA / MFA: Two-/multi-factor authentication — a second step beyond your password.
• Passkey: A password replacement using your fingerprint, face, or PIN; resists phishing.
• Phishing: Fake messages tricking you into giving up passwords or money.
• Deepfake: AI-generated fake video, audio, or images.
• Encryption: Scrambling data so only authorized people can read it.
• End-to-end encryption: Only you and the recipient can read the content — not even the service.
• Malware: Malicious software (viruses, ransomware, spyware).
• Password manager: An app that stores and fills unique strong passwords for you.

Smart home and devices

• Matter: A standard that lets smart-home devices work across Apple, Google, and Amazon.
• Thread: A low-power mesh network for small smart-home devices.
• IoT: "Internet of Things" — everyday objects (lights, locks, sensors) connected to the internet.
• Firmware: The built-in software that runs a device; updates fix bugs and security holes.

Data and the cloud

• Cloud: Storing data and running software on remote servers instead of your own device.
• Edge / on-device: Processing data locally on your device instead of the cloud — faster and more private.
• Backup: A copy of your data kept elsewhere in case the original is lost.
• Bit vs. Byte: A byte is 8 bits; speeds are often in bits (Mbps), storage in bytes (GB) — which is why they don't line up.

Bottom line

You don't need to memorize all 40 — just knowing what they mean turns confusing product pages and settings into plain choices. Keep this handy the next time a spec sheet, a news story, or a setup screen throws an acronym at you, and the jargon stops being a barrier.