A graduation is the awarding of a diploma by an educational institution. It may also refer to the ceremony that is associated with it, which can also be called commencement, congregation, convocation or invocation. The date of the graduation ceremony is often called graduation day. Graduates can be referred to by their year of graduation.
Postgraduate education, graduate education, or graduate school consists of academic or professional degrees, certificates, diplomas, or other qualifications usually pursued by post-secondary students who have earned an undergraduate (bachelor's) degree.
The organization and structure of postgraduate education varies in different countries, as well as in different institutions within countries. The term "graduate school" or "grad school" is typically used in North America, while "postgraduate" is more common in the rest of the English-speaking world.