An internist is a medical doctor who specializes in the diagnosis, treatment, and prevention of adult diseases. They focus on comprehensive care, often managing complex medical conditions and coordinating with other specialists when necessary. Internists are trained to handle a wide range of health issues, from chronic illnesses like diabetes to acute problems such as infections. Internists typically work in outpatient settings, hospitals, or clinics, providing long-term care for their patients. They emphasize health maintenance and disease prevention, often performing routine check-ups and screenings. Their expertise is crucial for managing overall health and ensuring patients receive appropriate care throughout their lives.