A psychiatrist is a medical doctor who specializes in diagnosing, treating, and preventing mental health disorders. They are trained to understand the complex relationship between emotional and physical health and can prescribe medication, provide psychotherapy, and implement other treatments to help manage conditions such as depression, anxiety, bipolar disorder, and schizophrenia. Psychiatrists often work in various settings, including hospitals, private practices, and mental health clinics, collaborating with other healthcare professionals to offer comprehensive care to their patients.