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Ultra-high-definition television (also known as Ultra HDTV, Ultra HD, UHDTV, UHD, and Super Hi-Vision) consists of two digital video formats with a 16:9 aspect ratio: 4K UHD and 8K UHD. NHK Science & Technology Research Laboratories suggested them originally, and the International Telecommunication Union later defined and authorized them (ITU). It is a digital television (DTV) standard that succeeds high-definition television (HDTV), which succeeded standard-definition television (SDTV) (SDTV).

On October 17, 2012, the Consumer Electronics Association declared that “Ultra High Definition,” or “Ultra HD,” will be used for displays with a 16:9 or larger aspect ratio and at least one digital input capable of transmitting and showing native video at a minimum resolution of 38402160 pixels. The Ultra HD Forum was founded in 2015 with the goal of bringing together the end-to-end video production ecosystem to assure interoperability and develop industry norms to speed up the adoption of ultra-high-definition television. The forum provided a list of up to 55 commercial services accessible throughout the world delivering 4K resolution, up from just 30 in Q3 2015.
During a press conference at the Consumer Electronics Show (CES) 2016, the “UHD Alliance,” an industry consortium of content creators, distributors, and hardware manufacturers, announced the “Ultra HD Premium” specification, which defines the resolution, bit depth, color gamut, high-dynamic-range imaging (HDRI), and rendering (HDRR) requirements for Ultra HD (UHDTV) content and displays to carry their Ultra HD Prefix.

Ultra HD, UHD, UHDTV, and 4K are all terms for ultra-high-definition television. Because Hi-Vision was the word used in Japan for HDTV, 8K UHDTV will be referred to as Super Hi-Vision in Japan. Companies had previously exclusively used the term 4K in the consumer electronics industry during the 2012 CES, but this had changed to “Ultra HD” during the 2013 CES. The Market Electronics Association chose “Ultra HD” after considerable consumer research, and the phrase was adopted with the debut of “Ultra HD Blu-ray.”

UHDTV-1 has a resolution of 3840 pixels wide by 2160 pixels tall (8.3 megapixels), which is four times that of current 1080p HDTV, which has a resolution of 1920 x 1080 (2.07 megapixels) (full HDTV).
2160p and 4K UHD are other terms for the same thing. Although it has a resolution that is somewhat comparable to 4K digital cinema formats, it should not be confused with other 4K resolutions such as the DCI 4K/Cinema 4K (4096 x 2160). The RGB stripe type has an overall resolution of 8.3 mega pixels.
UHDTV-2, also known as 4320p and 8K UHD, is 7680 pixels wide by 4320 pixels height (33.18 megapixels), which is sixteen times as many pixels as current 1080p HDTV, bringing it closer to the resolution level of 15/70 mm IMAX. Super Hi-Vision is the name given by NHK to the 8K UHDTV format with 22.2 surround sound.

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