Illusion refers to a distortion of the senses, revealing how the brain interprets sensory information. It can occur in various forms, such as visual, auditory, or tactile, leading to a perception that differs from reality. For example, optical illusions trick the eyes into seeing something that isn't there or misinterpreting the size or shape of objects. Illusions are not just tricks; they provide insight into how our minds work. They highlight the complexities of perception and cognition, showing that what we see is not always the same as what is actually present. Understanding illusions can help in fields like psychology and art.