A college has only one major, for example, only medical major is called medical college. The university has many majors, such as social security and chemistry. Of course, this is just a qualification. Whether to call a university or just a college requires the approval of the Ministry of Education.
The main difference between ordinary colleges and universities lies in their scale, which is not as big as a university, and their majors are not as good as a university. Therefore, many colleges are actively trying to set up majors and turn them into universities. Few schools are direct universities, and they all come out step by step. For example, a small number of students cannot be called universities.