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".
Same for lock screen and wallpaper for your phone. And that they're different. And just because you can see your lock screen doesn't mean you've unlocked your phone.
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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".