We usually misunderstand graduate students as master students, but they are not. Graduate students include master students and doctoral students. Higher education qualifications can be divided into: junior college, undergraduate course, master's degree and doctor's degree. Degrees are divided into: bachelor's degree (bachelor's degree), master's degree and doctoral degree.

Postdoctoral is not a degree, it refers to the stage of engaging in research work or research in colleges and universities for a certain period after obtaining a doctorate; It also refers to the personnel who carry out special research in postdoctoral mobile stations.