Video jargon can quickly get complicated. But the basics of video are comparatively simple and easily learned, and the rest can follow from that.
4K UHD
This is the 4K video format used by most cameras. It's not strictly 4K as the horizontal resolution is 3,840 pixels not 4,000 or above, but it's close enough for most purposes, especially as it preserves the same 16:9 ratio used by the Full HD and Standard HD formats and, indeed, most laptop and computer screens and TVs.