Psychology seems unfamiliar to most people. In definition psychology is the science or study of the mind and body. Most people think if a person has no physical problem means the person is healthy. But from the aspect of psychology, mental health is a major part of a person's health. Psychology plays a decisive role to human being.
	There are theories of some psychiatrist's. Freud: unconscious, repression of sexual impulses Jung: collective unconscious; failure of individuals to realize all aspects of their personality Adler: inferior complex Rank: psychological traumas happen from birth Fromm: freedom is stressful Horney: treatmeant by patients, not instinct, was the primary problem