What is the full form of HD

HD stands for High Definition. HD is basically the quality of image you will see on electronic devices of the images and videos. The electronic device’s screen i.e. television, mobile, laptop etc. has to display various videos and images but the quality of those files depends on the resolution. 

HD picture or video refers to any picture or video system of higher resolution than SD (Standard-Definition) video, and most commonly involves display resolutions of 1920×1080 pixels (1080i/1080p) or 1280×720 pixels (720p).