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A layer mask is something that you apply to a given layer to control the transparency of that particular layer. Layer opacity controls the transparency of the entire layer at once, a mask gives you more precise controls over very specific areas. If you want the entire layer to be at 40%, you would lower the opacity, if you want just the left side of a layer to be at 40%, you would use a mask.

Layers are one of Photoshop’s most powerful features as they are individual slices of information that can be stacked or moved to create your image composition. Using layers, one can draw, edit, paste, and reposition elements on one layer without disturbing the others.

Before we start and the directly go to the layer mask, first we need to know in brief that how Photoshop work or we can say what are the things which is required for photoshop working. Photoshop which is an essential application to create designs and edit the images to make the digital world creative.