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Personality encompasses a person's unique blend of behavioral, cognitive, and emotional patterns that shape their adaptation to life. These patterns are relatively stable but can evolve over time. While a universally agreed-upon definition of personality is lacking, most theories focus on motivation and interactions with the environment. Trait theories, like those developed by Raymond Cattell, define personality based on traits that predict behavior. In contrast, behaviorally-oriented approaches emphasize learning and habits. Regardless of perspective, most theories recognize the relative stability of personality. The study of personality psychology seeks to understand the underlying tendencies that drive individual behavioral differences. Psychologists explore personality through various lenses, including biological, cognitive, learning, trait-based, psychodynamic, and humanistic perspectives. The field's diverse approaches reflect the influence of prominent early theorists such as Sigmund Freud, Alfred Adler, Gordon Allport, Hans Eysenck, Abraham Maslow, and Carl Rogers.

Personality is any person's collection of interrelated behavioral, cognitive and emotional patterns that comprise a person’s unique adjustment to life.[1] These interrelated patterns are relatively stable, but can change over long time periods.[2][3]
Although there is no consensus definition of personality, most theories focus on motivation and psychological interactions with one's environment.[4] Trait-based personality theories, such as those defined by Raymond Cattell, define personality as traits that predict an individual's behavior. On the other hand, more behaviorally-based approaches define personality through learning and habits. Nevertheless, most theories view personality as relatively stable.[2]
The study of the psychology of personality, called personality psychology, attempts to explain the tendencies that underlie differences in behavior. Psychologists have taken many different approaches to the study of personality, including biological, cognitive, learning, and trait-based theories, as well as psychodynamic, and humanistic approaches. The various approaches used to study personality today reflect the influence of the first theorists in the field, a group that includes Sigmund Freud, Alfred Adler, Gordon Allport, Hans Eysenck, Abraham Maslow, and Carl Rogers.