Saturation represents how pure a color is. As an example of saturation, think about what happens when you make chocolate milk. You start by adding the chocolate syrup or powder to the empty glass. Then just add a little milk and stir it up. It's very chocolatey and deep brown. Add a little more milk. It's still brown, but not as deep. Keep adding more and more milk. The more milk you add the more faded the chocolate looks even though the mixture is still brown. If we added gallons and gallons of milk our mix would keep getting more faded until it looks almost white. And of course we would flood the kitchen!