Please answer a question about the following article about University:

Universities created by bilateral or multilateral treaties between states are intergovernmental. An example is the Academy of European Law, which offers training in European law to lawyers, judges, barristers, solicitors, in-house counsel and academics. EUCLID (Pôle Universitaire Euclide, Euclid University) is chartered as a university and umbrella organisation dedicated to sustainable development in signatory countries, and the United Nations University engages in efforts to resolve the pressing global problems that are of concern to the United Nations, its peoples and member states. The European University Institute, a post-graduate university specialised in the social sciences, is officially an intergovernmental organisation, set up by the member states of the European Union.

What type of school is the European University Institute?
post-graduate