CATV originally stood for Community Access Television but is now more commonly known as Cable TV. CATV is one of the most common methods of transmitted television signals to a consumer's home, using radio frequency signals transmitted through coaxial cable. More recently, CATV can also be transmitted using optical fiber, which utilizes pulses of light to transmit a signal.
CATV offers analog and digital channels (including high definition). Receiving digital channels typically requires a cable box for conversion.