Follow
A Doctor of Philosophy (PhD, Ph.D., or DPhil; Latin: philosophiae doctor or doctor philosophiae) is the most common degree at the highest academic level, awarded following a course of study and research. The degree is abbreviated PhD (sometimes Ph.D. in the U.S.), from the Latin Philosophiae Doctor, pronounced as three separate letters (/piːeɪtʃˈdiː/, PEE-aych-DEE). The abbreviation DPhil, from the English 'Doctor of Philosophy', is used by a small number of British and Commonwealth universities, including Oxford, formerly York, and Sussex, as the abbreviation for degrees from those institutions. PhDs are awarded for programs across the whole breadth of academic fields. Since it is an earned research degree, those studying for a PhD are required to produce original research that expands the boundaries of knowledge, normally in the form of a dissertation, and defend their work before a panel of other experts in the field. The completion of a PhD is typically required for employment as a university professor, researcher, or scientist in many fields.