Wallpaper (also desktop picture and desktop background) is an image used as a background of a graphical user interface on a computer screen or mobile communications device.
On a computer it is usually for the desktop, while for a mobile phone it is usually the background for the 'home' or 'idle' screen.
Though most devices comes with a default picture, the user can usually change it to a file of their choosing.
"Wallpaper" is the term used in Microsoft Windows before Windows Vista (where it is called the Desktop "Background"),
while Mac OS X calls it a "desktop picture" (previously, the term desktop pattern was used to refer to a small pattern that was repeated to fill the screen).
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