High Definition is basically increasing the resolution of digital TV broadcasts to show more detail compared to the 625 lines of PAL or 525 of NTSC. Older Than They Think: Analog broadcasts in HD go back to the 1950s, but did not take off until the 2000s. Furthermore, computer users with VGA monitors have effectively had HD since the 1990s. These three resolutions are generally regarded as HD: * 720p (1280x720, progressive-scan) * 1080i (1920x1080, interlaced) * 1080p (1920x1080, progressive-scan)