CMYK
CMYK (Cyan, Magenta, Yellow, Key) is a color model commonly used for offset printing.
Cyan, Magenta and Yellow are respective color inks and Key stands for black ink.
All artwork submitted to us should use CMYK color model and/or Pantone colors.
See Also
- Wikipedia in-depth article on CMYK: http://en.wikipedia.org/wiki/CMYK_color_model