Background Remove / Knockout
Background Remove / Knockout is commonly used for taking out the product/object from its background for creating product catalogs, inserting an object to a portion on a design. Background remove/Knockout sometimes refers to the related service like Clipping Path / Image Masking when asked an object (like hair, fur, translucent images like glasses, flames, lighting etc.) to leave it on transparent background or on a different background.
Background Knockout service is needed to create transparency without losing the translucency, change/use a customized background, to put on a catalog / magazine which work smoothly with fine edges.