What do levels do in overwatch?

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Tags

1. #level
2. #battles
3. #points
4. #these
5. #earning
6. #receive
7. #earned
8. #experience
9. #levelling
10. #reward
11. #overwatch
12. #highest
13. #participating
14. #difficulty
15. #involved
16. #based
17. #games
18. #medal
19. #quick
20. #match
21. #greater
22. #bonus