Function first, publicity function, that is, using radio and television as a modern mass media to timely promote the Party's line, principles, and policies, as well as the achievements made by the people under the guidance of the Party's line, principles, and policies; Secondly, the educational function is to use radio and television to disseminate knowledge, especially modern scientific and technological knowledge, to the audience, continuously improving the scientific and cultural quality of the entire nation; Thirdly, the supervisory function refers to the use of mass media such as radio and television to supervise social and economic activities and public opinion, in order to establish a positive attitude and correct all unhealthy tendencies. Radio and television have obvious basic functions of the information industry, including the production and transmission of information, the optimization of social resource allocation, and the management of information. The categories are divided into wireless broadcasting and wired broadcasting by transmission method. Only broadcasting sound is called "sound broadcasting", abbreviated as "broadcasting"; The broadcasting of images and sound is called "television broadcasting", abbreviated as "television". Feature 1: Visualization: conveying information in the form of sound and images. 2. Timeliness: Transmitting information at the speed of radio wave propagation. 3. Extensiveness: The most widely covered medium of communication