Psychiatry is the medical branch that is interested with the protection of mental health the community, prevention of mental illness, diagnosis, treatment and rehabilitation of the people with mental disorders and development of mental health. The main studying area of Psychiatry  is the examination of   human beings,  dealing  with their mentality, emotions, attitudes, problems arise with their  adaptability to environment and  the treatment  and prevention  of these problems. It has sub-branches such as biological psychiatry, psychodynamic psychiatry, consultation-liaison psychiatry, geriatric psychiatry.