The document discusses different types of broadcasting including institutional public address systems, satellite radio and TV, internet channels, low-powered community radio, and national radio and TV. It describes how each type transmits audio, video, and other content to audiences using various technologies like radio waves, satellites, cables, and the internet. The key methods are one-to-many transmission models using transmitter towers, satellites, or streaming over the web to reach small local areas or nationwide/global audiences on demand or in real-time.