What are Google affinity audiences?

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Tags

1. #audience
2. #google
3. #created
4. #expected
5. #history
6. #interests
7. #targeting
8. #these
9. #broad
10. #based
11. #affinity
12. #buckets
13. #general
14. #predefined
15. #placed
16. #search
17. #browsing
18. #groups
19. #audiences