HD of High Definition is a term that is most often used to describe TV sets and videos that have higher resolutions compared to the standard. Standard definition TV sets and video are commonly called as 480p, referring to the 480 rows of pixels from top to bottom. HD usually contains 720 or 1080 rows from top to bottom, thus the 720p/1080p designations.
The general objective for HD capable screens and videos is to provide a much finer display than SD. This is very comparable to digital cameras and the need for a greater megapixel count to produce better images. The difference between HD and SD might not be very noticeable when dealing with smaller displays. But once you use a much bigger display, it then becomes apparent that the SD picture tends to be blockier or more pixilated compared to HD. This is because of the need to maintain the same number of pixels no matter how big the screen. Smaller screens have smaller pixels and bigger screens would have bigger pixels that might start getting noticed. A 720p display can be up to 1.5 times bigger than a 480p display while maintaining the same pixel size.
Read more: Difference Between SD and HD | Difference Between
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