HD
(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". 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
