What is a no follow backlink?

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Tags

1. #target
2. #influence
3. #robots
4. #attribute
5. #hyperlink
6. #should
7. #instruct
8. #about
9. #doindex
10. #engine
11. #optimization
12. #engines
13. #whenever
14. #ranking
15. #search
16. #words
17. #dofollow
18. #index
19. #nofollow
20. #common
21. #noindex
22. #value