Read Tom Rielands article about digital television What is DTV?
DTV is “digital television.” DTV is a revolutionary new form of television that delivers top quality all-digital audio and video programming to viewers over the air, via cable and through satellite. DTV encompasses Surround Sound audio, high definition pictures, standard definition pictures, and data broadcasting. It can also multicast pictures of several programs simultaneously. Many digital TV programs will incorporate a wider-screen viewing area which approximates the more natural viewing experience of most motion pictures in theaters.