Sigmund Freud developed the psychoanalytic approach to personality, which viewed unconscious motivations as influencing behavior. Freud proposed three parts of personality:
1) The id operates on the pleasure principle, seeking instant gratification of needs.
2) The ego acts rationally according to reality, balancing the id's desires.
3) The superego incorporates societal morality and ideals, judging the id and ego.
Freud believed personality is determined by unconscious drives related to basic instincts for life, death, and sexuality. Psychoanalysis examines repressed memories and wishes through techniques like free association.