An illusion is an apparent reality or a misinterpretation of reality. The image that a person has of reality is based on his perceptions through the senses and processing of these signals in the brain. Illusions are therefore based on erroneous perceptions of real external stimuli, as opposed to hallucinations.
Illusions cannot exist without sensory perception, they are a wrong interpretation of them. Dreams and hallucinations are perceptions without an external stimulus underlying them. They are only apparently coming from a sense. Drugs can also cause hallucinations. A dream is actually a kind of processing of visual images by the brain
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