What are Google Analytics affinity categories?

Related questions

1. How does Google know your age?
2. Do you know who I am Google?
3. What is Google Analytics SEO?
4. How is SEO ranking calculated?
5. How does Google Analytics know age and gender?
6. What are Google affinity audiences?
7. What percent of teens use social media?
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Tags

1. #website
2. #customers
3. #three
4. #reach
5. #there
6. #visitors
7. #google
8. #analytics
9. #under
10. #aware
11. #potential
12. #interests
13. #section
14. #brand
15. #reporting
16. #categories
17. #shares
18. #affinity
19. #category
20. #product