What is CMYK/CMY? (Cyan/Magenta/Yellow/Black)

There are two different colour spaces in the field of image processing: CMYK and RGB. When editing images for printing, the CMYK colour space is always used. The individual letters stand for components of the CMYK colour profile. “C” stands for cyan, “M” stands for magenta, “Y” stands for yellow and “K” for black.