Radio waves and television waves are just two parts of the electromagnetic spectrum. The electromagnetic spectrum also includes microwaves, infrared waves, visible light, ultraviolet waves, X-rays, and gamma rays. All electromagnetic waves travel at the speed of light.
The speed of radio and television waves is important for a number of reasons. For example, it determines how fast information can be transmitted over a radio or television signal. It also affects how far a radio or television signal can travel.
The speed of light is a fundamental constant of nature. It is the same in all parts of the universe, regardless of the observer's motion. This makes the speed of light a useful tool for measuring distances in the universe.