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In sociology, a social group refers to any set of people who are, have been, or anticipate being in some kind of interrelation. This can range from a pair of individuals to an entire nation.1

Sociologists classify groups in various ways. A key distinction is between primary groups, characterized by intimate, face-to-face relationships like families and close friends, and secondary groups, which involve more formal, often contractual ties, such as work associations.1

A membership group is one an individual currently belongs to, like a family or a specific class. In contrast, a reference group is a group whose values and attitudes an individual uses as a benchmark, or a group they aspire to join. Social movements also involve a sense of membership, where individuals share dissatisfaction and a vision for a better order, often adhering to specific norms and values. Conformity is the process of aligning one's beliefs and actions with those of a group.123

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