This document discusses personality traits and trait theories in psychology. It begins with an introduction to traits, noting that they shape individual personality and mental well-being. It then describes several influential trait theorists, including Gordon Allport, Hans Eysenck, and Raymond Cattell. Allport focused on cardinal and secondary traits, while Eysenck proposed the dimensions of extraversion-introversion and emotional stability. Cattell identified 16 personality factors through factor analysis. The document also discusses the goals of trait theory in describing personality, predicting behavior, providing assessment frameworks, and understanding consistency and variability in traits. It concludes by noting that trait theories only describe rather than explain personalities and the importance of paying attention to mental health using trait theories.