You may have noticed that when I only had the one Background layer in my document, it was highlighted in blue in the Layers panel. Then, when I added Layer 1, it became the highlighted layer. And now Layer 2 is the highlighted layer. When a layer is highlighted, it means it’s currently the active layer. Anything we do in the document is done to the contents of the active layer. Each time we add a new layer, Photoshop automatically makes it the active layer, but we can manually change which layer is the active layer simply by clicking on the one we need. Here, I’ll make Layer 1 the active layer by clicking on it, and we see that it becomes highlighted