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Social identity is a theory formed by Henri Tajfel and John Turner to understand the psychological basis of intergroup discrimination. It is composed of three elements:

• Categorization: We often put others (and ourselves) into categories. Labeling someone as a Muslim, a Turk, or soccer player are ways of saying other things about these people.
• Identification: We also associate with certain groups (our ingroups), which serves to bolster our self-esteem.
• Comparison: We compare our groups with other groups, seeing a favorable bias toward the group to which we belong.

As developed by Tajfel, Social Identity Theory is a diffuse but interrelated group of social psychological theories concerned with when and why individuals identify with, and behave as part of, social groups, adopting shared attitudes to outsiders. It is also concerned with what difference it makes when encounters between individuals are perceived as encounters between group members. Social Identity Theory is thus concerned both with the psychological and sociological aspects of group behaviour.

Reacting against individualistic explanations of group behaviour (e.g. Allport) on one hand, and tendencies to reify the group on the other, Tajfel sought an account of group identity that held together both society and individual. Tajfel first sought to differentiate between those elements of self-identity derived from individual personality traits and interpersonal relationships (personal identity) and those elements derived from belonging to a particular group (social identity). Each individual is seen to have a repertoire of identities open to them (social and personal), each identity informing the individual of who he is and what this identity entails. Which of these many identities is most salient for an individual at any time will vary according to the social context. Tajfel then postulated that social behaviour exists on a spectrum from the purely interpersonal to the purely intergroup. Where personal identity is salient, the individual will relate to others in an interpersonal manner, dependent on their character traits and any personal relationship existing between the individuals. However, under certain conditions 'social identity is more salient then personal identity in self-conception and that when this is the case behaviour is qualitatively different: it is group behaviour.'

"Social identities... are associated with normative rights, obligations and sanctions which, within specific collectivities, form roles. the use of standardized markers, especially to do with the bodily attributes of age and gender, is fundamental in all societies, notwithstanding large cross-cultural variations which can be noted." by Giddens

• Social Identity Theory (University of Twente)
• Ingroup loyalty, outgroup hostility: The power of tribes in evolution