Broadcasting is the distribution of audio or video content to a dispersed audience via any electronic mass communications medium, but typically one using the electromagnetic spectrum (radio waves), in a one-to-many model. Broadcasting can be done via radio, television, cable, satellite, and the Internet. Broadcasting is the business of producing and distributing audio and video content to an audience. It includes radio and television stations, networks, cable systems, and other media outlets. Broadcasting is a major part of the entertainment industry, and it is also used for educational, religious, and political purposes.