A doctor is a highly skilled healthcare professional who has completed extensive education and training in medical science. They diagnose and treat illnesses and injuries, prescribe medication, and provide advice on maintaining good health. Doctors can specialize in various fields such as pediatrics, cardiology, or neurology. They are responsible for conducting medical examinations, ordering tests, and interpreting results to formulate accurate diagnoses. Doctors work in a variety of settings, including hospitals, clinics, and private practices, often collaborating with other healthcare professionals to provide comprehensive care. Their main goal is to promote and restore the health and well-being of their patients.