Wallpaper (noun)

1. A material used to cover and decorate the interior walls of a building.
2. An electronic image or picture used as a background on a computer screen or mobile device.

Origin:

From the late 18th century, from the phrase "wall paper" meaning "paper for covering walls".

Examples:

1. She picked out a new wallpaper for the living room.
2. The wallpaper in the bedroom was an old-fashioned floral pattern.
3. He changed the wallpaper on his phone to a photo of his family.
4. She put up a new wallpaper in the kitchen.
5. The wallpaper on his computer was a beautiful landscape.