Alan Turing asked the question in 1950, and chatbots have made it urgent again.
If a machine's answers are indistinguishable from a human's, should we say it thinks? Turing proposed we stop arguing about definitions and look at behavior.
John Searle disagreed. Imagine a person who follows a rulebook to answer Chinese questions without understanding a word. The room behaves intelligently, yet nobody inside understands. Syntax is not semantics.
We still have no agreed test for consciousness, even in humans. Maybe the real lesson is how little we understand our own minds.