But what is AI?

📋 30-second summary

• “AI” is a broad label. Here it almost always means conversational AIs: ChatGPT, Claude, Gemini.
• Two families not to mix up: specialized AI (spam filter, Siri) and AI that chats with you.
• It doesn’t “think”, isn’t “always right”, doesn’t “want” anything, isn’t magic.
• Free version = freemium, like Spotify: paid subscriptions and investors foot the bill.

When today we hear “artificial intelligence”, we mean programs able to do things that used to require a person: understand a piece of text, recognize a voice, suggest the next word as you type a message, answer a question. It isn’t a single technology. It’s a label that lumps together many very different things.

In recent years “AI” has become, for almost everyone, a synonym for one specific kind: the ones you can hold a conversation with, usually by typing, like ChatGPT, Claude, Gemini.

You have probably already used it

You care about understanding it because it is already in your pocket. When your phone completes a word for you while you type a message, when Google Maps suggests a route that’s “three minutes faster”, when Netflix recommends your next film, when spam ends up in the trash without you moving it: there is some form of AI behind it. Most of these are boring but useful things that have been saving you time for years.

All of this happened before ChatGPT came along. At the end of 2022, it became the first AI product anyone could use, with no preparation, to have a real conversation about any topic. That was the moment AI walked out of research labs and into everyone’s hands.

Two families you shouldn’t mix up

When someone says “AI” in a practical context, they usually mean one of these two things:

1. AI that does one thing well. The spam filter in your inbox, voice recognition in Siri or Alexa, your keyboard’s autocomplete, photos that recognize faces. These have been around for years, and they help you in ways you no longer notice. Each one is specialized: Siri understands you when you ask for a timer but it can’t write a poem, the spam filter doesn’t know how to chat, autocomplete has no clue who your contacts are.
2. AI that talks (conversational). ChatGPT, Claude, Gemini, Copilot and similar. Born in the last few years, these are the ones that made noise. When the newspaper writes “AI”, almost always it means these.

In this guide we focus on the second. The reason is that this is the category that has changed the most about what you can do today, without being a developer: ask for information, get help writing, summarize documents, learn new things at your own pace.

Yes, they are different from each other

ChatGPT, Claude, Gemini, Copilot and similar all do comparable things: you write, they answer. But they are products of different companies (OpenAI, Anthropic, Google, Microsoft) with different tones, prices, integrations and strengths. To get started, one is as good as another. We’ll see how to pick one in the next lessons.

Four myths to clear up right away

AI is surrounded by misconceptions. Some come from movies, others from sensationalist headlines. Here are the four most common ones, out of the way.

• It doesn’t “think” like a person. It has no experiences of its own. By default each conversation starts from zero, even if you talked to it yesterday (some products add an optional “memory” An optional feature in some products that lets the AI remember things across chats. By default each new conversation starts from zero. feature, which we’ll cover later). When it sounds convincing, it is doing something very different from what your brain does.
• It isn’t “always right”. It can make mistakes and it can make things up, and when it does, it does so with the same confidence as when it says true things. Recognizing when it’s getting things wrong is one of the things you’ll take home from this manual.
• It doesn’t “want” anything. It has no desires or intentions. It responds to what you write. It isn’t judging you, it has no plans for you. (A separate question is “but where does what I write go?”: that’s about the company behind the AI, not the AI itself, and we cover it in a dedicated lesson.)
• It isn’t magic. It is a very sophisticated program, made by people, with real limits and real costs (for whoever runs it).

One thing to take home

When you hear “AI” on TV, in an article, or from a friend, ask yourself right away which kind it is. Is it a “does one thing” type (filter, recognition, suggestion), or a “talks” type (ChatGPT, Claude, Gemini)? Often the debate gets confused because someone is talking about one and the listener is thinking about the other.

Then why can I use it for free?

The companies behind these AIs offer a free basic version so you can try the product. They make money from paid subscriptions (for the more capable versions) and from investors who are betting on the future. It’s a “freemium” model like Spotify or Dropbox.

What we don’t cover here

AI is a huge field. In this guide we don’t talk about:

• Image-generating AI (Midjourney, DALL-E, Stable Diffusion).
• AI for robotics, self-driving cars, medical diagnosis.
• The philosophical side (consciousness, the idea of “singularity”, the hypothetical moment when an AI becomes more intelligent than humans).
• Political and regulatory debates, except where they help you understand a practical limit.

We focus on how to use conversational AI to do useful things in your life. Everything else can wait.

Check what you understood

📝 Check-in with your AI

Four questions to lock in the ideas

5-7 min of check-in

Paste the text into your AI. It will ask you four progressive questions about the lesson, one at a time, and give you feedback.

Copy the text below and paste it into your favourite AI (Claude, ChatGPT, Gemini, or another). Or download the file and give it to your AI as an attachment.

Copy the text Download Open

What comes next

• What is a prompt? The word that describes what you write to the AI to get an answer.
• Your first conversation. The moment you open an AI and use it yourself, with a guided exercise.