What's the difference between illusion, delusion, and hallucination?

What's the difference between illusion, delusion, and hallucination?
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Answer :

Without looking the words up, here is my take on them. Illusions are things that appear to be different from what they are. Optical illusions are an example. A delusion is something we believe that has no basis in reality. A hallucination is something that we imagine perceiving with our senses that is not really there.
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