A medical Doctor or a Physician is a person that takes care of those who have diseases or illnesses. To become a medical doctor you have to first go to college for about 4 years, and then to medical school for 2 or 3 more years. Then you become a resident doctor; this is when you can specialize in any of the medical doctor specializations.
Physician in the broad sense, usual in
Physician is still widely used in the older, narrow sense, especially outside