How do overwatch ranks work?

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Tags

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