CYMK
Used to describe the four inks used to print - Cyan, Yellow, Magenta & Key (Black). The ink is usually applied in the same order as the abbreviation. It was first used in 1906, when the Eagle Printing Ink Company incorporated the four colour wet process inks for the first time - discovering the 4 colours can be combined to produce a vast and almost unlimited number of rich colours.
RGB
Used to describe red, green and blue light that are added together to reproduce a broad range of colours. The main purpose of RGB is for use in digital screens, such as laptops and televisions, the colours we see on the screen are dependent on how our device interprets the colour model. Colour printers do not use this colour model as it relies on emitting light, if all three colours are mixed together at the same quantity you get pure white.
CYMK vs RGB
CYMK is used for printing onto materials and lacks the brightness of RGB because they are missing the bonus of a lighted screen. When starting a project it is essential to think about what the output will be, if it will be print based then it is better to design in CYMK because you don't want any nasty surprises if you design in RGB and then try to print. However if the work you are creating is going to be all digitally based then the better option is definitely RGB.
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