The document discusses different types of doctors and their specializations. It defines the differences between physicians and doctors, with doctors requiring more education and training including residencies. It then lists and defines various medical specializations like cardiologists, neurologists, orthopedic surgeons, and others. It also provides data on average yearly salaries for different doctor specializations, ranging from pediatricians and family medicine doctors earning around $156,000-165,000 to radiologists, orthopedic surgeons, and cardiologists among the lowest paid at around $309,000-315,000 and dermatologists and ophthalmologists among the highest paid at around $270,000-283,000.