Psychoanalysis is a theory and therapy method that aims to release repressed emotions and memories to lead to healing. It involves investigating the interaction between conscious and unconscious elements of the mind. Sigmund Freud developed psychoanalysis and believed people could be cured by making their unconscious thoughts conscious, gaining insight. He proposed stages of psychosexual development and that the id, ego, and superego interact in the conscious, preconscious, and unconscious levels of the mind. Defense mechanisms protect the ego from anxiety by repressing or redirecting thoughts and feelings.