What is AI?

You’ve heard the word everywhere, often from people who seem to assume you already know what it means. This page starts from zero. No math, no history lesson.

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The short version

AI, short for artificial intelligence, is a broad name for technology that lets computers do tasks that usually take some kind of human thinking. Understanding language, recognizing patterns, making predictions, solving problems.

It’s a category, like “vehicle.” A bicycle and a cargo ship are both vehicles and have almost nothing else in common. A spam filter and a chat assistant are both AI, and the same is true of them.

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You’ve been using it for years

Most AI never announces itself. A lot of it has been around long enough that nobody calls it AI anymore.

• Your email’s spam filter learned what junk looks like from a very large number of examples.
• Your map app’s arrival time is a prediction built from traffic patterns.
• Your phone’s photo search finds “dog” or “beach” without you labeling a single picture.
• Autocorrect and the suggested next word on your keyboard guess what you meant to type.
• “Because you watched” recommendations predict what you’ll pick next.

Each of those does one narrow job. None of them can hold a conversation.

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What changed: generative AI

Generative AI is a type of AI that creates new content, such as text, images, audio, or code, based on the instructions or information you give it.

That’s the part that got loud. Instead of sorting your email or predicting traffic, you can type a request in ordinary sentences and get a written draft back. Ask for a polite reply to a landlord and it writes one. Paste in a confusing letter and it explains it in plainer words.

It does this by learning patterns from an enormous amount of text (or images, or audio). It’s very good at producing something that fits the pattern of a good answer. That is not the same as knowing whether the answer is true, which is why a later page in this series is about exactly that.

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AI is not the same thing as ChatGPT

ChatGPT is one product, made by one company, OpenAI. It’s a generative AI chat assistant, and it’s so well known that people use its name for the whole category, the way people say “Kleenex” for any tissue.

There are others of the same kind. Claude, Gemini, and Microsoft Copilot are three you’ll see on this site. And a great deal of AI isn’t a chat assistant at all, including everything in the list above.

So when someone says “I used AI for that,” they might mean a chat assistant, a photo tool, a feature inside their spreadsheet, or something that has been quietly running in their email for a decade.

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Something you can try

About two minutes. Open any AI chat app. A free account is enough. Type this:

Explain what you are in three sentences, for someone who has never
used an AI chat tool. Then tell me one thing you're bad at.

Read what comes back with one question in mind: which parts of this could I check? That habit matters more than anything it says about itself.

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Something important to know

It sounds confident whether it’s right or wrong. Generative AI writes in the same even, reasonable tone when it gets something right and when it invents something. There’s no tell in the writing. Every useful habit on this site starts from that fact.

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If it doesn’t match what you see

The app looks different from what you expected. These apps change their layout often. Look for a text box, usually at the bottom of the screen, where you type a message. That’s the part that matters.

It asked you to sign up or pay. The four chat assistants on the Compare tools page each had a free tier when that page was last checked. What’s free changes, so check the official site before you pay for anything.

Its description of itself is wrong or out of date. That happens. These tools aren’t always accurate about their own features. Treat what it says about itself as a claim, not a fact.