What is difference between sales and presales?

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Tags

1. #product
2. #until
3. #making
4. #verified
5. #sense
6. #services
7. #their
8. #should
9. #exclusive
10. #usually
11. #transferred
12. #close
13. #sales
14. #company
15. #makes
16. #mutually
17. #presales
18. #opportunity
19. #primary
20. #happen
21. #qualify
22. #customer