what is 4k resolution size

4K resolution refers to a horizontal display resolution of approximately 4,000 pixels. Specifically, it has a resolution of 3840 x 2160 pixels (4K UHD) in television and consumer media, while the movie projection industry uses 4096 x 2160 pixels (DCI 4K) . This means that 4K resolution has four times as many pixels as Full HD, which has a resolution of 1920 x 1080 pixels. The total number of pixels in a 4K display is about 8.3 million. The terms "4K" and "UHD" are often used interchangeably, but technically, 4K resolution is 4096 x 2160 pixels, while UHD resolution is 3840 x 2160 pixels.