CMYK stands for Cyan, Magenta, Yellow, and Key color (which is black). CMYK is the color model used for printing presses. It is based on the chemistry of mixing translucent printing inks rather than paint. It is called subtractive because if you mix cyan, magenta, and yellow together, you get black.
RGB stands for Red, Green, Blue. It is based on the way the light mixes on a computer screen. It is called an additive color model because if you add red, green and blue together, you get pure white light.
Tints, shades and neutrals are those colors which are not pure and vivid. They are created in different ways.