If you're new to digital editing software, you might be wondering what's so great about Layers.
Well, layers offer you the ability to structure your image file into many parts.
For example, in a painting you can have a seperate layer for the distant background, details in the midground and a character in the foreground.
The great thing about this is that you can now change the position of the person in the foreground or change the colors of the background all without affecting the other layers!
In other words, layers keep your images flexible so that you can make changes at any time to specific parts of it.