HDTV (High-definition television) is video that has resolution substantially higher than that of traditional television systems. HDTV has one or two million pixels per frame, roughly five times that of SD.
Early HDTV broadcasting used analog techniques, but today HDTV is digitally broadcast using video compression.
High-definition display resolutions
720p
1280×720
Standard HDTV resolution and a typical PC resolution (WXGA), frequently used by high-end video projectors; also used for 750-line video, as defined in SMPTE 296M, ATSC A/53, ITU-R BT.1543.
1080p/1080i
1920×1080
Standard HDTV resolution, used by Full HD and HD ready 1080p TV displays such as high-end LCD, Plasma and rear projection TVs, and a typical PC resolution (lower than WUXGA); also used for 1125-line video, as defined in SMPTE 274M, ATSC A/53, ITU-R BT.709;
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