A Doctor of Medicine (MD) is a professional degree for physicians and surgeons. This degree typically requires four years of medical school after completing an undergraduate degree. MDs are trained to diagnose and treat various medical conditions, perform surgeries, and provide preventive care. After earning their MD, graduates must complete a residency program in their chosen specialty, which can last from three to seven years. Once training is complete, they must pass licensing exams to practice medicine. MDs can work in various settings, including hospitals, clinics, and private practices, and may also engage in research or teaching.