AI does not understand your question and then write a reply. AI predicts one word at a time. AI looks at all the words that came before, and picks the most likely next word. Then AI looks at everything again, including the word it just picked, and predicts the next one. This keeps going until the full response is built.

This means every word AI has seen so far shapes what comes next. The previous words are the context. Change the context, change the output.

This is why what you type matters so much. Your words are the context AI uses to predict everything that follows.