A doctoral degree otherwise known as Ph.D. is the highest form of degree program that one can complete. Enrollment into a doctoral degree program requires you to hold a master’s degree. Obtaining this type of degree can take four to six years. Ph.D. graduates work as experts in areas of business or research.
The most common types of doctoral degrees include: Doctor of Philosophy (Ph.D.), Juris Doctor (J.D.), Doctor of Medicine (M.D.) and Doctor of Dental Surgery (DDS).
Unlike bachelor's or master's programs, applying for a PhD is quite different. Aside from meeting eligibility requirements, you also need to find a PhD supervisor and present a research proposal. More information about the PhD application process here.