A doctor is considered one of the most prestigious and respected careers. There are a number of different abbreviations after a doctor's name, and while it’s unlikely that you will know them all, some are better known than others.

There are a variety of different types and specializations of doctors. For example:
The training for a doctor depends upon what country you are in, and the standards of the country. For example, in some countries you can go straight to medical school after secondary school (or high school). In other countries, you have to attend college before you can go to medical school.
In the United States, you have to first attend college before you can apply to medical school. In college, there are required courses that you must take to apply to medical school. Some of these courses include the following:
After you take the required courses, you also have to take the entrance exam for medical school, called the Medical College Admission Test, also known as the MCATs. The MCATs has four sections: Physical Sciences, Verbal Reasoning, a Writing Sample, and Biological Sciences. The highest score that you can receive on the test is a 45.
If you get admitted to medical school, it is a four year process. Throughout medical school, you have to take several standardized tests that you must pass. For example, after your second or third year (depending upon your medical school), you have to take the USMLE Step 1 test.
The standardized tests that you take throughout medical school are all various parts of the United States Medical Licensing Examination. The examination is broken up throughout medical school, and you need to pass it if you want to practice medicine in the United States.
After you graduate from medical school, and you pass the boards, you then need to complete a residency in a specific field. This field should be the specialty that you want to pursue, such as surgery or pediatrics. If you want to, you can choose to specialize even further after your residency with a fellowship.