Imagine you’re texting with a friend who has read a huge pile of books and messages. Every time you send a word, they don’t “look up the truth” in a database first — they guess what word should come next based on patterns they’ve seen before.

That’s the core idea behind an LLM: it is a very advanced autocomplete. It works with small pieces of text, remembers only a limited amount of the recent conversation at once, and keeps choosing the next piece over and over until it finishes an answer. Sometimes it sounds brilliant, and sometimes it confidently guesses wrong, because it is predicting text, not checking facts like a search engine.