What does HD mean?
High Definition
Video HD (HD video) video or high-resolution, High-definition video), etc. to System video with a resolution higher than the video resolution standard (SD) is said to be, and mainly includes a resolution of 720×1280 pixels (720p) or 1080×1920 pixels (1080i/1080p). This article is about the basic concepts video resolution, discussed above, does not specific applications of it in television broadcast (HDTV), the format of the recording image, optical disc, Blu-ray and format of video tape, D-VHS.