1. Doctor of Medicine (M.D.): This is the degree earned by medical doctors who have completed medical school and obtained a license to practice medicine.
2. Doctor of Philosophy (Ph.D.): This degree is awarded to individuals who have completed advanced research and scholarship in a specific academic field. Ph.D. holders are often involved in teaching and research at universities or other educational institutions.
3. Doctor of Education (Ed.D.): This degree is similar to a Ph.D. but focuses on the field of education. Ed.D. holders may work as educators, educational administrators, or researchers.
4. Doctor of Jurisprudence (J.D.): This degree is earned by individuals who have completed law school and obtained a license to practice law.
5. Doctor of Veterinary Medicine (D.V.M.): This degree is obtained by individuals who have completed veterinary school and obtained a license to practice veterinary medicine.
The abbreviation "Dr." is also sometimes used before the names of individuals who have earned other types of doctoral degrees, such as a Doctor of Business Administration (DBA), Doctor of Science (Sc.D.), or Doctor of Arts (D.A.).
When addressing a person with a doctorate degree, it is customary to use the title "Dr." followed by their last name. For example, if someone has a Ph.D. in Biology, they may be addressed as "Dr. Smith."