What's the point of Reddit karma?

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Tags

1. #comments
2. #upvoted
3. #comment
4. #reddit
5. #lower
6. #karma
7. #flavors
8. #earned
9. #posting
10. #content
11. #downvoted
12. #points
13. #comes
14. #scoreboard
15. #popular
16. #number
17. #reward
18. #links