Personality structure refers to the organized pattern of thoughts, feelings, and behaviors that make an individual unique. It is often conceptualized through various models, such as the Big Five personality traits, which include openness, conscientiousness, extraversion, agreeableness, and neuroticism. These traits help to describe how people typically respond to different situations and interact with others. Another influential model is Sigmund Freud's theory, which divides personality into three components: the id, ego, and superego. The id represents basic instincts and desires, the ego mediates between the id and reality, and the superego embodies moral standards. Together, these elements shape an individual's personality and influence their behavior.