What is the purpose of seasons in Diablo 3?

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Tags

1. #should
2. #paragon
3. #recurring
4. #opportunity
5. #optional
6. #materials
7. #items
8. #levels
9. #start
10. #allows
11. #months
12. #earned
13. #previously
14. #season
15. #hardcore
16. #seasons
17. #character
18. #without
19. #every
20. #leveling
21. #fresh
22. #scratch
23. #normal