Postgraduate is a broad term for any study done after a bachelor’s degree. A master’s degree is one type of postgraduate study. Doctoral degrees, graduate certificates, and professional degrees are postgraduate too.
In the United States, people usually say graduate school or graduate degree. In the United Kingdom and several other countries, postgraduate is the standard word for the same level. So a master’s and a postgraduate degree are not two different things. A master’s sits inside the postgraduate category.
The confusion often comes from program names. A postgraduate diploma, for example, is usually shorter than a full master’s and may not include a thesis. If you are comparing options, check the length, the credits, and whether the award says master’s, diploma, or certificate.
Related articles: master’s vs postgraduate differences, master’s degree vs postgraduate, and is a master’s undergraduate or postgraduate.

