A peer group is a social group consisting of humans. A peer group is a primary group of people, typically informal, who share a similar or equal status and who are usually of roughly the same age, tended to travel around and interact within the social aggregate Members of a particular peer group often have similar interests and backgrounds, bonded by the premise of sameness. However, some peer groups are very diverse, crossing social divides such as socioeconomic status, level of education, race, creed, culture, or religion.[citation needed]
Unlike the family and the school, the peer group lets children escape the direct supervision of adults. Among peers, children learn to form relationships on their own. Peer groups also offer the chance to discuss interests that adults may not share with their children (such as clothing and popular music) or permit (such as drugs and sex).
Developmental psychologists, Lev Vygotsky, Jean Piaget, Erik Erikson, and Harry Stack Sullivan, have all argued that peer relationships provide a unique context for cognitive, social, and emotional development, with equality, reciprocity, cooperation, and intimacy, maturing and enhancing children's reasoning abilities and concern for others. Modern research echoes these sentiments, showing that social and emotional gains are indeed provided by peer interaction.