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Webopedia Staff
Last Updated May 24, 2021 7:34 am
The term 720p refers to 720 lines of progressive video (720 lines per frame). Higher resolution than standard DVD, which is 480i or 480p. Usually refers to 1280×720 resolution in 1.78 aspect ratio. [Source: LG Guide to HDTV]

See also HDTV.
Also see Webopedia’s “Did You Know…All About Digital TV . DTV and HDTV“.