What is CMYK ?

Answer 1

CMYK stands for cyan, magenta, yellow, and key or black. These are the four colors of ink used in the traditional method of printing hardcopies of images, called offset printing.

Hope it will help (:

Answer 2

Here some informations to RGB and CMYK colors

https://code.sololearn.com/ccsGqu2wW37O/?ref=app

Answer 3

This is colors: Cyan, Magenta, Yellow, Black