Traditional photo editing is ‘destructive’. That means every adjustment you make permanently changes the pixels in the photo and there’s no way back unless you’ve saved a copy of the original and you’re willing to start again. ‘Non-destructive’ editing is fully reversible. You can go back and undo or redo all of your editing work […]
A special type of layer in image-editing software which is designed to hold adjustments rather than other image layers. It's a way of 'stacking' a series of adjustments to an image without affecting the image layer itself.