What is the difference between nofollow and dofollow links?

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Tags

1. #links
2. #dofollow
3. #these
4. #attribute
5. #ranking
6. #humans
7. #those
8. #engines
9. #contain
10. #credibility
11. #which
12. #engine
13. #linking
14. #website
15. #webmaster
16. #potential
17. #improve
18. #nofollow
19. #search
20. #follow