As the highest academic credential, the PhD consists of rigorous, in-depth training and novel, independent scholarship. Students may enter many PhD programs with only a Bachelor's degree, though some require a Master's degree. Other common requirements include extensive undergraduate or postbaccalaureate research experience. PhDs are typically full-time endeavors and some may include funding to support living expenses.
Detailed descriptions of each program and their admissions requirements can be found on the PhD Program's page.