High definition or HD may refer to:
Visual technologies Blu-ray Disc, the universal optical High Definition disc format HD Photo, former name for the JPEG XR image file format HDV, format for recording high-definition video onto magnetic tape HiDef, 24 frames-per-second digital video format High-Definition Multimedia Interface (HDMI), all-digital audio/video interface capable of transmitting uncompressed streams High-definition television (HDTV), television signals and apparatus with higher resolution than their contemporary counterparts Ultra-high-definition television, a further step in television resolution, but not a successor. High-definition video, used in HD broadcasting, digital film, computer HD video file formats, and video games
Audio technologies Dolby TrueHD, lossless audio compression codec DTS-HD Master Audio, lossless audio compression codec High Definition Compatible Digital, discontinued digital audio optical disc format High-definition audio, general marketing term for high fidelity audio products and services Intel High Definition Audio, 2004 Intel specification for hardware and associated drivers for Personal computer audio Wideband audio, also known as HD voice, is high definition voice quality for telephony audio
Music "Hi-Definition", 2008 single from Lupe Fiasco's The Cool High Definition (Joe Morris album), 2008 High Definition (Shootyz Groove album), 1999 "High Definition", a single from Waterparks' 2019 album, Fandom
Other High Definition (radio program), 2006 Canadian radio program High-definition map, used in autonomous driving