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The basics

What is an LLM?

In one line

The “brain” behind a chat AI. Large Language Model.

LLM stands for “large language model.” Think of it as the engine inside a chat AI — the part that actually produces the words. It learned by reading an enormous amount of text, so it's brilliant at language. You don't need to know how the engine works to drive the car; you just need to know it's the thing doing the talking.