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The unique pattern of psychological and behavioral characteristics by which each person can be distinguished from other people.

Personality is fundamental to the study of psychology. The major systems evolved by psychiatrists and psychologists since Sigmund Freud to explain human mental and behavioral processes can be considered theories of personality. These theories generally provide ways of describing personal characteristics and behavior, establish an overall framework for organizing a wide range of information, and address such issues as individual differences, personality development from birth through adulthood, and the causes, nature, and treatment of psychological...