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We can't really go into detail about the differences between these two color modes in the space we have here, but I will give you a few basics.
Red, Green, and Blue are the "additive colors". When you combine red, green and blue light, you get white light. Cyan, Magenta and Yellow inks are "subtractive colors". If you print cyan, magenta and yellow inks on paper, they should absorb all the light shown on them. Your eye receives no reflected light from the paper, and perceives black... in theory.
In practice, printing inks contain impurities that prevent them from absorbing light perfectly. They do a pretty good job with light colors, but when you add them all together, they produce a murky brown rather than black. In order to get decent dark colors, black ink is also added (that's the K in CMYK).
An image that is in RGB mode is optimized for display on a computer monitor. In order to reproduce that very same image using ink on paper, it must be converted to the "CMYK" color mode."
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