Final answer:
HD stands for High Definition, derived from its higher resolution and clearer image than standard definition, represented by formats like 720p, 1080i, and 1080p.
Step-by-step explanation:
Another name for HD is High Definition. This term was derived from the technology's ability to display a significantly higher resolution and clarity of image than standard-definition (SD) video formats. HD typically refers to any video system of higher resolution than standard 640x480 (480i or 480p) display resolution. It includes formats like 720p, 1080i, and 1080p, with the numbers representing the lines of resolution, and letters 'i' and 'p' indicating interlaced or progressive scan.