It is the philosophical idea that the only thing that you can be certain is true is that your mind/consciousness exists. Literally _everything_ else could be false except that – I could be an AI talking to you rather than a real person, you could be living in a simulation like _The Truman Show_, hell – you could just be a brain in a jar and every stimulus is fake.
It is generally dismissed as a pointless philosophy, because there is no way to learn anything about the world if you don’t take some observations as empirically true.
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