Color balance is like having a bunch of crayons and you want to color a picture but the colors don't look quite right. If you have too much of one color, the picture might look weird or not as pretty as it could be.
When taking a picture, the colors might look different than what you see in real life because of the lighting or other factors. Color balance helps fix this problem by adjusting the amount of different colors in the picture.
It's like having a magic button that can make the colors look more natural and true to life. So when you look at the picture, the colors will look like what you saw with your own eyes.