* Pictures are pictures, a medium different from text and other forms.

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----------------* Wallpaper is a background image used to display on your desktop. To put it bluntly, wallpaper is also a picture, and it is a background image displayed on the desktop.

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-------------So, pictures include wallpapers, and wallpapers are a type of pictures.

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============= Advantages and Disadvantages?

Not all pictures are suitable for wallpaper. They must be of the right size. Otherwise, if a very small picture is used as wallpaper, it will appear blurry when displayed on the entire desktop.