In psychology, similarity is defined as the extent to which people, objects, or ideas have common attributes. It is essential in perception, attraction, and learning. The similarity principle states that people are likely to establish relational and associative groupings with those who are like them in terms of values, alignment, interests, or physical characteristics. In cognitive psychology, similarity also pertains to the memory and categorization functions. Illustration: A pair of friends has an easy time forging a bond due to their shared interests in music and congruent personality attributes.
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