I've closed my other panels, so that we can focus on the Layers panel. To get a sense of how layers are constructed, let's take a look at this Layers panel. Each layer contains separate pieces of content. You might think of layers like separate flat pints of glass, stacked one on top of the other. If you're following along, open this layered image from the downloadable practice files for this tutorial. So, it's important to understand, what layers are and why to use them - which we'll cover in this video. Layers are the building blocks of any image in Photoshop.