The Five-Factor Model of Personality, often called the Big Five, is a widely used psychological framework that describes personality through five main traits: Openness (creativity and curiosity), Conscientiousness (organization and responsibility), Extraversion (sociability and energy), Agreeableness (kindness and cooperation), and Neuroticism (tendency toward stress and emotional instability). Psychologists use this model to understand how people think, feel, and behave across different situations.