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(High Definition)

A broad term applied to any number of digital media formats and/or technologies that provide improved detail and resolution. It is used primarily with regard to video images, but is also sometimes used to refer to still images, and sometimes audio.

Audio/visual content can be HD. That content must be captured with HD-capable technology, and requires HD-capable technology to view in full detail.

Most commonly, HD refers to 720p and 1080p (or 1080i) video content.

See: 720p

See: 1080p

It is also used to refer to phone displays with pixel dimensions that match 720p or 1080p video content. 720 x 1280 pixels is the minimum resolution considered "HD", while 1080 x 1920 pixels is often called "full HD" (FHD).

See: Full HD

Often a plus sign is added to indicate that the display technically has more pixels than 720 x 1280. For example, a modern phone with an "HD+" display might have 720 x 1560 pixels.

In this context, HD is also used as a baseline for multiples, including Quad-HD.

See: Quad HD

In audio, HD Voice provides greater audio clarity than standard phone voice quality.

See: HD Voice

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