Quick meaning
An animated background image on your phone or computer home screen.
Think of it like this
Like replacing a framed photograph with a small fish tank — more dynamic but uses more energy.
Where you may see this
You may see this inside app stores, app settings, software updates, and install instructions.
Why it matters
Knowing the term helps you understand what an app is asking you to do before you tap, install, or change anything.
Say it simply
Live Wallpaper means: An animated background image on your phone or computer home screen.