What is Secret Santa gift exchange?

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Tags

1. #tradition
2. #community
3. #western
4. #identity
5. #giver
6. #group
7. #santa
8. #assigned
9. #randomly
10. #secret
11. #opened
12. #revealed
13. #until
14. #person
15. #after
16. #christmas
17. #members
18. #which