HD or high definition television refers to any resolutio that is higher than SD or standard resolution. The most common resolution is 720p or 720 pixels. The beginning of HDTV started in 1970 in Japan at the Japanese Broadcasting Corporation and after nearly 35 of try and failure the high definition TV started making its way to main stream. Today as we have seen, analog TV or screens that don't contain up to date high definition or digital features are almost obsolete and don't work with current cable or satellite companies. HDTV delivers a much higher resolution than any other resolutions such as SCTV. High definition has changed the way we watch television and watch movies. When we look at high definition screens the resolutions are so high that it can be hard to differentiate the image from real life.
http://www.audioholics.com/education/display-formats-technology/hdtv-past-present-and-future-part-i-history
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