This is the tendency to mimic other people in order to fit in. We see this happen quite often in the clothes people wear, the leisure activities they participate in, and even in their mood:

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The tendency to mimic other people in order to fit in is known as the chameleon effect. This can be observed in various aspects of behavior, such as mannerisms, speech patterns, and even emotional expressions.

This Is the Tendency to Mimic Other People in Order