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A background, also called wallpaper, can be a pattern, texture, normal picture, in fact anything that is used as a background to place other images on or in front of it. Typically the term is used to describe the image which you have on your computer screen, or desktop as it is commonly called. There are thousands of backgrounds found on Internet and every website uses one in some form, even if just plain. Backgrounds are also used in presentations, for example using the Power Point programme, where the transparency of the background can be faded so as not to detract from the presentation content.
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