In psychology, identity is the qualities, beliefs, personality, looks and/or expressions that make a person (self-identity) or group (particular social category or social group).The process of identity can be creative or destructive.
A psychological identity relates to self-image (one's mental model of oneself), self-esteem, and individuality. Consequently, Weinreich gives the definition "A person's identity is defined as the totality of one's self-construal, in which how one construes oneself in the present expresses the continuity between how one construes oneself as one was in the past and how one construes oneself as one aspires to be in the future"; this allows for definitions of aspects of identity, such as: "One's ethnic identity is defined as that part of the totality of one's self-construal made up of those dimensions that express the continuity between one's construal of past ancestry and one's future aspirations in relation to ethnicity" (Weinreich, 1986a).
Gender identity forms an important part of identity in psychology, as it dictates to a significant degree how one views oneself both as a person and in relation to other people, ideas and nature. Other aspects of identity, such as racial, religious, ethnic, occupational… etc. may also be more or less significant – or significant in some situations but not in others (Weinreich & Saunderson 2003 pp26–34). In cognitive psychology, the term "identity" refers to the capacity for self-reflection and the awareness of self.(Leary & Tangney 2003, p. 3)
Sociology places some explanatory weight on the concept of role-behavior. The notion of identity negotiation may arise from the learning of social roles through personal experience. Identity negotiation is a process in which a person negotiates with society at large regarding the meaning of his or her identity.
Psychologists most commonly use the term "identity" to describe personal identity, or the idiosyncratic things that make a person unique. Meanwhile, sociologists often use the term to describe social identity, or the collection of group memberships that define the individual. However, these uses are not proprietary, and each discipline may use either concept and each discipline may combine both concepts when considering a person's identity.