Correspondence: It is a learning form of adult higher education and belongs to a learning level of higher education. Teachers are mainly sent to correspondence stations to organize face-to-face lectures and examinations in winter and summer vacations or national legal holidays according to the teaching plans of various majors. Distance education is one of the qualifications of adult education. Refers to the use of television and the Internet and other media teaching mode. Extended information correspondence: it is a learning form of adult higher education and belongs to a learning level of higher education. Mainly according to the teaching plan of each major, teachers are sent to various correspondence stations to organize face-to-face lectures and examinations during winter and summer vacations or national legal holidays. Other forms of adult higher education include part-time study (evening university) and full-time study (full-time). Passed the national adult college entrance examination and was admitted to colleges and universities, and issued admission notices. Belonging to the national education series, the state recognizes academic qualifications, participates in the national unified adult college entrance examination and enrollment examination, and all provinces and regions organize enrollment in a unified manner. Distance education, distance education, also called online education in some documents issued by the Ministry of Education, is one of the qualifications of adult education. It refers to the teaching mode of using TV and Internet, which breaks through the boundaries of time and space and is different from the traditional teaching mode of on-campus accommodation. Students who use this teaching mode are usually amateurs. Because you don't need to go to a specific place to attend classes, you can attend classes anytime and anywhere. Students can also learn from each other through various channels, such as TV broadcast, internet, special counseling hotline, class research club and face-to-face teaching (correspondence). It is a new concept after modern information technology is applied to education, that is, education by using network technology and environment. Enrollment targets are not limited by age and previous academic qualifications, which provides opportunities for people who have entered the society to improve their academic qualifications.