Undergraduate education is education taken prior to gaining a first degree, hence in many subjects in many educational systems, undergraduate education is post-secondary education up to the level of a bachelor's degree, such as in the United States, where a university entry level is known as undergraduate, while students of higher degrees are known as graduates.

Postgraduate education (synonymous in North America with graduate education, and sometimes described as quaternary education) involves studying for degrees or other qualifications for which a first or Bachelor's degree is required, and is normally considered to be part of tertiary or higher education. In North America, this level is generally referred to as graduate school.

The organization and structure of postgraduate education is very different in different countries, and also in different institutions within countries

List of American Colleges and Universities