What Is an LLM?

An LLM is a program that reads and writes text by predicting the most likely next word.

In short

LLM stands for "Large Language Model". It's a program that learned how language works from huge amounts of text. When you ask it something, it isn't pulling a memorized answer off a shelf. It calculates the most likely next word, over and over, until a full response takes shape.

How does an LLM learn?

During training, the model reads billions of texts: books, websites, code. It picks up patterns — for example, that "the sky is" is often followed by "blue". It doesn't understand the world the way a person does. It's extremely good at recognizing patterns in language.

Why is that useful?

Because language covers almost everything: questions, code, ideas, plans. A good LLM can therefore help you code, write text, explain things, translate, and chat like an assistant.

One important limit

An LLM doesn't know "the truth". It knows what sounds statistically likely. That's why it can be wrong even when the answer sounds completely confident (see Hallucination).