HDTV (High Definition TV) is a digital television display that provides high-quality picture and sound. Your standard definition television is broadcast in 480p, that means only half the video quality of HDTV. So, you can compare HDTV programming is transmitted between 720p and 1080i. The most significant difference between standard definition and high definition is the lack of that grainy visual that is not seen with HDTV. HDTV presents to the viewer a smoother, clearer and brightly colored picture. It seems like you are looking at something through and out of a window!