If I ask a human what their favorite flavor of ice cream is, they will answer based on their actual preference for different kinds of ice cream.
If I ask a chat LLM what its favorite flavor of ice cream is, it will select a statistically likely answer to the question.
That's the difference.
For reference: my favorite ice cream flavor is cake batter, but only if it's the one at Cold Stone. If it's from somewhere else, I go with cookie dough.