It turns one good photo into many uses: a white background for marketplaces, a terrace for the homepage, a festive scene for a seasonal sale. The product, model and pose don't change, only the world around them.
Cut-and-paste swaps give themselves away. The light on the product comes from one side and the sun in the new scene from another, the shadow is missing, the edges glow. A believable swap relights the subject for the new scene and puts a real contact shadow where it meets the ground.
