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.
4 K: стоковое видео в 4K и HD | Shutterstock
https://www.shutterstock.com/ru/video/search/4k
Contemporary Painter Creating Abstract Modern Art. 4k00:30Abstract motion background shining gold 4k00:13confident business woman walking in airport smiling independent female executive...
4K Videos on Vimeo
https://vimeo.com/channels/4k
The best high quality 4k videos on Vimeo, curated by the Vimeo staff. Enjoy these ultra high definition (UHD) videos for free or as an OnDemand purchase in 24p