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A wallpaper or background (also known as a desktop wallpaper, desktop background, desktop picture or desktop image on computers) is a digital image (photo, drawing etc.) used as a decorative background of a graphical user interface on the screen of a computer, smartphone or other electronic devices. On a computer, wallpapers are generally used on the desktop, while on a mobile phone they serve as the background for the home screen. Though most devices come with a default background image, modern devices usually allow users to manually change the background image.

The term "wallpaper" was used in Microsoft Windows before Windows Vista (where it is called the "desktop background"), while macOS refers to it as "desktop picture". On older systems which allowed small repeated patterns to be set as background images, the term desktop pattern was used.

Wallpaper images are usually copyrighted as many other digital images found on the Internet, and as such, most websites collecting and share wallpapers, as well as the users downloading from them are an example of mass copyright infringement, a phenomenon which challenges the meaning and illegality of digital piracy and the validity of current copyright legislation around the world.