Television signals are electromagnetic waves that carry audio and video information from a broadcasting station to a television set. These signals can be transmitted through various methods, including terrestrial antennas, satellite, and cable systems. The signals are encoded to ensure that the content is delivered clearly and without interference. There are two main types of television signals: analog and digital. Analog signals were the traditional method of broadcasting, but they have largely been replaced by digital signals, which provide better picture and sound quality. Digital signals can also support additional features, such as high-definition (HD) content and interactive services.