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cabo pulmo national park mexico 5k 4k wallpaper diving fish booking rest travel vacation ocean beach kimbe bay papua new guinea silfra iceland truk lagoon micronesia worlds best diving sit or background (also known as a 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 device. 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.