Last updated on Aug 04, 2020

Applied to any format with a height of 2160 pixels, but it is most commonly used in reference to the 4K UHDTV resolution of 3840×2160 due to its association with the well-known 720p and 1080p HDTV formats. Although 3840×2160 is both a 4K resolution and a 2160p resolution, these terms cannot always be used interchangeably, since not all 4K resolutions are 2160 pixels tall, and not all 2160p resolutions are ≈4000 pixels wide.