CMYK is a color space for defining colors in the print area. In four-color print (4C), all colors are put together out of the components cyan (C), magenta (M), yellow (Y) and black (K). A CMYK color code has four values between 0 and 100 which describe the intensity of the primary color. 0 means that nothing of that color is used, whereas 100 means that the color is used to maximum strength.
CMYK Colors