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In computers and mobile phone - communications devices, 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 main screen. Though most devices comes with a default picture, users can change the wallpaper 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).

Live wallpaper
Keeny creek waterfall in West Virginia, USA A 'live wallpaper' is a type of application that works on a mobile device using the Android operating system. The application works as a wallpaper – providing the background image for the home screen—but also works as a conventional application since it can provide user-interaction with the touch screen (allowing the image to change dynamically, for example) and access other hardware and software features within the device (accelerometer, GPS, network access, etc.).
Similar functionality could be found in the Active Desktop feature of Windows 98 and later versions. There is also third party software that provides this feature for various operating systems.

Mobile wallpaper
A mobile wallpaper is a computer wallpaper sized to fit a mobile device such as a mobile phone, personal digital assistant or digital audio player. The height is often greater than or equal to the width. Wallpapers can typically be downloaded at no cost from various websites for modern phones (such as those running Android, iOS, or Windows Phone operating systems). Modern smartphones allow users to use photos from the web; or photographs captured with a phone's camera can be set as a wallpaper.

Dynamic backgrounds
OS X has built-in support, via the Desktop & Screen Saver panel in its System Preferences, for cycling through a folder collection of images on a timed interval or when logging in or waking from sleep. Additionally, OS X has the native ability to run a screen saver on the desktop; in this configuration, the screen saver appears beneath the desktop icons in place of the system wallpaper. However, OS X does not come with a built-in interface to do this; it must be done through Terminal commands or various third-party applications.

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