Psychiatry is a meical specialty which exists to study, prevent, and treat mental disorders in humans. The science of the clinical application of psychiatry has been considered a bridge between the social world and those who are mentally ill. Both its research and clinical application are considered interdisciplinary. Because of this, various subspecialties and theoretical approaches exist in psychiatric research and practice. Psychiatrists can be considered physicians who specialize in the doctor-patient relationship utilizing some of medicine's newest classification schemes, diagnostic tools and treatments.