Personality theories are frameworks that help us understand the different ways people think, feel, and behave. These theories explore how our unique traits, experiences, and environments shape who we are. For example, the Big Five Personality Traits model identifies five key dimensions—openness, conscientiousness, extraversion, agreeableness, and neuroticism—that can describe a person's personality. Another important theory is Sigmund Freud's psychoanalytic theory, which emphasizes the influence of the unconscious mind and childhood experiences on personality development. By studying these theories, psychologists aim to better understand human behavior and improve mental health treatments, ultimately helping individuals lead more fulfilling lives.