There are three levels of college diplomas. They are junior college diploma, undergraduate diploma and postgraduate diploma. Diplomas based on academic level or education level mainly refer to three-level degree certificates: bachelor's degree certificate, master's degree certificate and doctoral degree certificate. In ancient times, an interest-deferred diploma was a certificate issued by the government. In today's society, it is used to represent a person's education level. Although a diploma can play a certain role in the work, it cannot be equated with ability, and a diploma is not equal to culture.