Internists are medical doctors who specialize in internal medicine, focusing on the prevention, diagnosis, and treatment of adult diseases. They are trained to manage complex medical conditions and often serve as primary care physicians, providing comprehensive care for patients with multiple health issues. These specialists do not perform surgeries but may coordinate care with other healthcare providers, such as surgeons or specialists. Internists are skilled in understanding how various systems in the body interact, making them essential in managing chronic illnesses like diabetes or hypertension.