Psychoanalysis was developed by Sigmund Freud and focuses on unconscious drives and desires, the structure of the mind into id, ego and superego, and uses techniques like free association and analysis of dreams and transference in therapy to make the unconscious conscious. Key concepts include determinism, the pleasure principle, psychosexual stages of development, and defense mechanisms. The goal of psychoanalytic therapy is to help patients gain insight into how past experiences shape current thoughts and behaviors through the therapeutic relationship and analysis of transference.