Human personality refers to the unique set of characteristics, traits, behaviors, and thought patterns that define how an individual interacts with the world and others. It encompasses emotional responses, social behaviors, and cognitive processes, influenced by both genetic and environmental factors. Psychologists often study personality using frameworks like the "Big Five" traits: openness, conscientiousness, extraversion, agreeableness, and neuroticism. These traits vary in intensity for each individual, creating a unique personality that influences personal preferences, relationships, decision-making, and responses to life’s challenges.