Adjustment layer
This is a layer that does not contain any actual image content but rather an image correction or effect. Adjustment layers, which function similarly to a red cellophane overlay on a print, will change the appearance of layers underneath them without actually affecting the content of those levels. As a result, adjustment layers are an essential component of reversible, "non-destructive" editing. At any point in time, the adjustment may be changed, buried, or eliminated entirely. When you add an adjustment layer to a picture, a mask is also automatically created. This allows the effect to be applied to some parts of the image to a lesser amount (or not at all), depending on the settings of the mask.
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