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For other uses of "HD", see HD (disambiguation).

High-definition, sometimes abbreviated as Hi-def or HD, commonly refers to an increase in display or visual resolution over a previously used standard.

Visual technologies[edit]

  • HD DVD, discontinued optical 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
  • High-definition video, used in HDTV broadcasting, digital film, computer HD video file formats, and video games

Audio technologies[edit]