What are steam profile backgrounds?

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Tags

1. #backgrounds
2. #either
3. #votes
4. #through
5. #active
6. #steam
7. #marketplace
8. #background
9. #friends
10. #trading
11. #creating
12. #profile
13. #items
14. #inventory
15. #change
16. #answer
17. #oldest
18. #badges