RGB (red, green, blue) and CYMK (cyan, yellow, magenta, black) are both colour formats in which your illustrations can be placed into digitally. They both effect how your work looks, so it is important to understand the differences.
The first (and most basic) thing to understand is in which context you should use either format - RGB applies much better to digital formats such as websites, whereas CYMK is made for printing usage such as posters and brochures.
RGB is an 'additive' model in which the three colours are added together to create the array of colours you see - if magnified, they will ultimately either be red, green or blue. CYMK is a subtractive format which works through the process of applying tiny dots bunched close together or far apart depending on what colour it is that we want.
Even if you do not have a thorough understanding of how it works, it is important to keep to-be-printed works in CYMK, as printers will often have only those colours and work only in that format, so RGB would not show up right.
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