Hue is an attribute of color that corresponds to a position on the visible light spectrum. Color is what we perceive. It may be comprised of a mixture of hues and also takes into account brightness.
When you draw with a marker, we usually think of this as adding color to the page, but it is actually the reverse. Adding ink is usually removing color. How? Pigments and inks absorb (turn into heat) some hues and transmit (reflect) other hues. “Blue” ink absorbs every color but blue. “Green” ink absorbs every color but green. This works fine, but it can be inconvenient. To print a picture of a colorful scene, a printer might need thousands of different inks to make all the colors.
Luckily, a simpler way exists, which is to mix different inks together so the paper reflects just the colors we want. But how do you add pigments together in order to remove colors? It works a lot like sculpting and it only takes a few specific ink colors. Imagine you want to show a green spot on a piece of white paper in sunlight. Sunlight contains the entire spectrum of light, so you already have green light hitting the paper. The problem is that you also have red, yellow, chartreuse and many, many more hues hitting the paper so you can’t see the green. So, you need a way to get rid of (subtract) the colors you don’t want.
Let’s be systematic. Green is in the middle of the spectrum. First, let’s get rid of all the light in the red to yellow range. Is there an ink that does that? Pure cyan blocks red-yellow light, only letting light in the blue to green part of the spectrum through.
Yellow ink absorbs light from the other end of the spectrum, allowing red to green light to pass through, so If we put a layer of cyan down and a layer of yellow down, the only color that will be able to make it through both pigments is green. Voila! You have essentially sculpted the light, removing all the colors from the white light that you didn’t want.
By using other pigment pairs, you can also make red and blue. Only red can get through magenta and yellow, and only blue can get through cyan and magenta. No color can get through all three.