Technology
36 explanations and counting.
How does autocorrect work?
Your phone's autocorrect isn't actually reading your mind — it's using clever probability tricks to guess what word you meant to type.
What is the dark web?
The dark web is like a hidden neighbourhood on the internet where you need special tools to visit — and it's not all as scary as it sounds.
How does a hard drive work?
Inside your computer is a spinning disc that stores your photos, games, and files using tiny magnetic dots — like a record player for data.
What is augmented reality?
Augmented reality lets you see digital things mixed into the real world around you — like Pokémon appearing in your garden or trying on glasses without touching them.
How does voice recognition work?
Your phone can recognise your voice better than some humans can — here's the clever tech that makes it happen.
What is a blockchain?
Imagine a record book that's impossible to fake, copies itself everywhere, and no single person controls it — that's basically what a blockchain is.
How does streaming work?
Every time you watch Netflix or listen to Spotify, millions of tiny data packets are racing through cables and airwaves to reach your device in perfect order.
How does a VPN work?
A VPN creates a secret tunnel through the internet that hides your online activity from prying eyes — like having a private conversation in a crowded room.
What is cybersecurity?
Cybersecurity is like having digital bodyguards protecting your computer from invisible thieves who want to steal your information.
How does a microchip work?
Every microchip is like a tiny city where billions of invisible switches flip on and off millions of times per second to power your digital world.
How does Bluetooth work?
Bluetooth lets your phone talk to your headphones without a wire — but how does it send music through thin air without everything getting tangled up?
What is a data centre?
"The cloud" isn't actually in the sky — it's in enormous buildings full of computers, cooled by industrial air conditioning.
What is open source software?
Open source software shares its recipe with the world — anyone can read it, improve it, or use it for free.
How does 3D printing work?
A 3D printer can make almost any physical object from scratch — by building it up one incredibly thin layer at a time.
How does a camera work?
Every photo you take captures light in a fraction of a second — here's the clever physics behind the picture.
How does a self-driving car work?
A self-driving car has no idea what a road "is" — it just processes enormous amounts of sensor data every second and makes decisions. Here's what's actually going on behind the windscreen.
What is biometric data?
Your fingerprint, face, voice, and even the way you walk are all unique to you. When technology collects and uses that information, it's called biometric data — and it's become central to both security and surveillance.
What is a neural network?
The AI systems behind face recognition, voice assistants, and ChatGPT are all built on neural networks — computer systems loosely inspired by the way brains work. Here's the idea.
What is DeepSeek?
In January 2025, a Chinese AI lab released a model that matched the best American AIs at a fraction of the cost. Stock markets shook. Here's what DeepSeek actually is and why it mattered.
How does a large language model work?
ChatGPT and tools like it can write essays, answer questions, and hold conversations. But there's no mind inside — just an extraordinarily clever pattern-matching machine trained on almost everything humans have ever written.
What is quantum computing?
Regular computers have been getting faster for 60 years. Quantum computers work on completely different principles — and for certain problems, they'd make today's fastest computers look like a pocket calculator.
How does facial recognition work?
Your phone unlocks by looking at your face. Police use it to identify suspects in crowds. Here's the technology behind it — and why it's so controversial.
How does social media work?
Billions of people use it every day. But what's the actual business model, and why are the apps designed the way they are?
What is an algorithm?
Algorithms decide what you see on social media, who gets a loan, and what music gets recommended to you. Here's what they actually are.
How does GPS work?
Your phone knows exactly where you are on Earth to within a few metres, at all times. Here's the elegant maths that makes it possible.
How do touchscreens work?
You press your finger on glass and a machine responds. The invisible technology that makes this work is stranger than it looks.
What is "the cloud"?
Your photos, documents, and music live "in the cloud." But where is the cloud, actually? It's more concrete — and more interesting — than the name suggests.
How does encryption work?
Every time you buy something online, your card details travel across the internet scrambled in a code so complex that no computer on Earth could crack it. Here's how.
How do batteries work?
A battery is basically a controlled chemical reaction in a can — turning stored chemical energy into electricity on demand.
What is coding?
Every app, website, and piece of software was built by someone writing instructions in a language computers can follow. Here's what that actually involves.
What is virtual reality?
Strap on a headset and step into a different world entirely. Here's how VR tricks your brain into believing it's somewhere it isn't.
How do search engines work?
You type a question and get a million answers in 0.4 seconds. The system behind that is one of the most complex ever built.
What is a computer virus?
Computer viruses are named after biological ones for a very good reason. Here's how malicious software works and why it spreads.
What is artificial intelligence?
AI can write essays, recognise your face, beat world champions at chess, and recommend your next favourite song. What's actually going on inside it?
How does the internet work?
You use it constantly, but the internet is a genuinely mind-bending engineering achievement. Here's how data gets from anywhere to your screen.
How does Wi-Fi work?
How does the internet get from a box in your hallway to your phone without any wires? It's basically invisible radio.