Image background or background image are the same terms which refers to the part of a photo that forms a setup for the main figures or objects in the photo. It acts as backdrop for the foreground image or object and can be removed easily. There can be multiple background images in a single photo.
Learn more about Cropping:
CSS background-image property by W3Schools
The difference between foreground and background images in web design by 1stwebdesigns
See also: