Personality can be defined as the set of psychological traits that distinguish individuals. The Big Five personality traits are agreeableness, conscientiousness, emotional stability, extraversion, and openness to experience. Personality is determined by biological factors, environmental factors like family and culture, and situational factors like work or home environment. At work, personality is reflected in traits like locus of control, self-efficacy, and core self-evaluation. Holland's theory proposes that personality types should match job types for optimal productivity and satisfaction. Personality-organization fit is also important, where personal values align with organizational culture.