This document summarizes key concepts from Chapter 10 of the textbook "Psychology: A Journey" regarding personality theories. It defines personality as stable behavior patterns that make up a person's identity. It describes several approaches to understanding personality, including trait theories, psychodynamic theories, behaviorist theories, social learning theories, and humanistic theories. It provides overviews of several major theorists' concepts, such as Freud's psychodynamic theory including the id, ego, and superego, and humanistic psychologists like Maslow who focused on self-actualization. It also summarizes the "Big Five" model of personality traits.