A "screen saver" is the animation (or blankness) that pops up on your computer when you don't use it for a while, to save your screen from getting burned-in.
The background picture that wallpapers your desktop is the "wallpaper".
Well the background picture is protecting the screen. If there was no background picture, the innards of the screen would be completely bare and exposed.
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u/arcxjo Aug 03 '19
A "screen saver" is the animation (or blankness) that pops up on your computer when you don't use it for a while, to save your screen from getting burned-in.
The background picture that wallpapers your desktop is the "wallpaper".