How does the ranking system work in overwatch?

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Tags

1. #amount
2. #compete
3. #overwatch
4. #level
5. #placement
6. #unlock
7. #system
8. #matches
9. #according
10. #heroes
11. #through
12. #granted
13. #rating
14. #scrutiny
15. #skill
16. #games
17. #players
18. #competitive
19. #ranking