Coloring in a picture will command your child's full attention, as they concentrate on completing their work, and having the finished product show that they have done their best. This is a welcome assistance for parents who struggle to provide their children with experiences that will captivate their attention, only to find that their little minds and bodies start wandering after only a short time. So as a parent, you gain a short respite as your child works on their coloring page, your child gets to participate in a fun activity that teaches them as well. Which leads me to the next point.
We have yet to discuss the benefit that your child will be learning about the different colors as they color their pages. And the more exposure your child has to coloring, the more they will learn about the typical colors of objects, and they will begin to choose specific colors for specific items, such as red apples, or green leaves. And, as they grow older, you will also begin to see that they will color animals the color that they truly are. This may seem obvious to somebody who has known their colors since they can remember, but you had to learn it at some point and this is a great way for your child to learn theirs.