What exactly is AI?

Artificial intelligence is everywhere: at work, at school, in the news. Yet few people can explain simply what it is. This first lesson lays the groundwork, without formulas or jargon.

A simple definition

Artificial intelligence is a program that can perform a task that used to require human intelligence: recognizing a face, understanding a sentence, translating a text, summarizing a document, suggesting an answer.

The difference from a traditional program fits in one sentence:

a traditional program follows rules written by a person (“if the customer is over 65, apply the discount”);
an AI learns its own rules from examples (millions of cat photos teach it to recognize a cat, without anyone writing down what an ear or a whisker is).

You already use it

AI did not arrive with ChatGPT. You probably use it every day:

your mailbox’s spam filter;
recommendations for films, videos or products;
your phone keyboard’s predictive text;
face unlock;
automatic translation and generated subtitles.

Why everyone is talking about it now

Since 2022, a new family of AI has become available to everyone: generative AI. It no longer just sorts or recommends, it creates: text, images, voice, video, code.

The best known are conversational assistants such as ChatGPT (OpenAI), Claude (Anthropic), Gemini (Google) or Copilot (Microsoft). You write to them as you would to a person, and they answer in natural language.

Three things made this leap possible:

Huge amounts of text available for learning.
Much more powerful computers, able to process those texts.
A new program architecture, invented in 2017, that is very good at understanding the meaning of words in context.

What AI is not

To use it with confidence, you also need to know what it is not:

It is not conscious. It feels nothing and has no intentions, even when it writes “I think”.
It does not know everything. Its knowledge stops at a certain date and it can be wrong with great confidence.
It does not replace your judgment. It suggests; you decide, you check and you remain responsible.

Key takeaways

AI learns from examples instead of following hand-written rules.
You already use it every day, often without knowing it.
Generative AI creates content and is driven in everyday language.
It is a powerful tool, not a person: your judgment remains essential.