What is CMYK & RGB?

CMYK stands for Cyan Magenta Yellow Black. The CMYK colour model is based on printing and ink absorbing into paper. To gain the greatest number of printable colours, from the fewest number of inks, CMYK colour printing is used. By using varying amounts of Cyan, Magenta, Yellow and Black, a great number of colours can be printed. Most full colour printed materials, magazines, posters, packaging, are printed using just the 4 CMYK inks.
RGB stands for Red Green Blue and are the colours used to create colours on your PC monitors. Each screen will represent the colour slightly differently as well so just keep the in mind – the blue you are see may be a shade lighter or darker.