A television signal is a type of electromagnetic wave that carries audio and visual information to a television set. This signal can be transmitted through various methods, including cable, satellite, and over-the-air broadcasting. The signal is encoded to ensure that the content is delivered clearly and without interference. When a television receives a signal, it decodes the information and displays it on the screen. The quality of the signal can affect the clarity of the picture and sound. Modern televisions often use digital signals, which provide better quality compared to the older analog signals.