What is 4k?
4K resolution
refers to a horizontal display resolution of approximately 4,000 pixels
4K resolution, also called 4K, refers to a horizontal display resolution of approximately 4,000 pixels.[1] Digital television and digital cinematography commonly use several different 4K resolutions. In television and consumer media, 3840×2160 (4K UHD) is the dominant 4K standard, whereas the movie projection industry uses 4096×2160 (DCI 4K).