wallpaper

noun
1
thick paper, often with a pattern on it, used for covering the walls and ceiling of a room
کاغذ دیواری
2
the background pattern or picture that you choose to have on the screen of your computer, mobile phone, etc.
پس‌زمینه, تصویر زمینه, والپیپر
You can download desktop wallpaper.
verb
1
to put wallpaper onto the walls of a room
کاغذ دیواری کردن, چسباندن کاغذ دیواری