How do ad words work?

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Tags

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2. #asking
3. #adwords
4. #system
5. #appear
6. #search
7. #google
8. #their
9. #which
10. #advertisers
11. #keywords
12. #certain
13. #clicks
14. #money
15. #order
16. #since
17. #makes
18. #results
19. #clickable
20. #advertising