Broadcast signals are electromagnetic waves used to transmit audio and video content over distances. These signals can be sent through various mediums, including radio waves, satellite, and cable systems. They allow information to reach a wide audience, making it possible for people to access television and radio programs. There are different types of broadcast signals, such as AM (Amplitude Modulation) and FM (Frequency Modulation) for radio, and DTV (Digital Television) for TV broadcasts. Each type has its own characteristics, affecting sound and picture quality, as well as the range of transmission.