I googled them and found that RBG means Red Green Blue and CMYK means Cyan Magenta Yellow Black. I don't understand why the last letter is black when it is a K in the acronym. RBG is what you see on your computer screen, it is the primary pigments. CMYK is what your printer prints through and is slightly duller in some cases.
You can also convert a picture to CMYK to have ore control over what your picture looks like. Also there are some colors that cannot be seen through CMYK. These colors are "out of the CMYK gamut." It seems that when you print your printer has a different color pallet and it won't come out the exact same as on your computer screen unless you convert it to CMYK.
All information came from:
"RGB to CMYK Conversion for Color Printing and CMYK Color Explained." Online Printing Services: Postcard Catalog & Brochure Printing Company. America's Print Shop, 2009. Web. 17 Nov. 2011. <http://www.printingforless.com/rgb-cmyk.html>.
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