4K VIDEOS - YouTube
https://www.youtube.com/playlist?list=PLD33E5618740295DF
COSTA RICA IN 4K 60fps HDR (ULTRA HD). Jacob + Katie Schwarz. Native American Fancy War Dance / 4K HDR 1000fps. Jacob + Katie Schwarz.
4K resolution - Wikipedia
https://en.wikipedia.org/wiki/4K_resolution
4K resolution refers to a horizontal display resolution of approximately 4,000 pixels. Digital television and digital cinematography commonly use several different 4K resolutions.