Background removal is a process of isolating the subject in an image and removing the background. This can be done using photo editing software like Adobe Photoshop or GIMP. The process involves creating a mask or selecting the subject using various tools and techniques, such as the Magic Wand tool or the Pen tool. Once the subject is isolated, the editor can remove the background or replace it with a different image or color. This technique is often used in product photography, where the subject is isolated and placed on a white background to create a clean and consistent look.