Ultra HD. UHD is a resolution of 3840 pixels × 2160 lines (8.3 megapixels, aspect ratio 16:9) and is one of the two resolutions of ultra high definition television targeted towards consumer television, the other being 8K UHD which is 7680 pixels × 4320 lines (33.2 megapixels).
in terms of ps4 pro 4k resolution mode is a resolution running at 3840 pixels × 2160 lines (8.3 megapixels, aspect ratio 16:9) and 60 fps on the newest ps4 pro consoles