What is relationship between High Definition and Digital?
Actually, high definition is a kind of digital television, and is also the top-level resolution offered within the digital television category. In fact, there are three formats in digital television – standard, enhanced, and high definition. A resolution of 480i is standard, 480p is enhanced, and 720p and 1080i are high definition( other high resolutions may also be high definition). Therefore, HD is digital, but not all digital is HD.