This document provides an overview of personality psychology. It discusses the definition of personality and factors that can influence personality, such as genetics, environment, self-image, life experiences, emotions, peers, culture, and intelligence. It also summarizes the Myers-Briggs Type Indicator personality assessment, developed based on Carl Jung's work. The assessment categorizes personalities into 16 types based on preferences for extraversion/introversion, sensing/intuition, thinking/feeling, and judging/perceiving. Statistics on personality types from research institutes and for the document's group are presented.