What's the purpose of speaker notes?

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Tags

1. #normal
2. #although
3. #users
4. #lives
5. #presenters
6. #important
7. #notes
8. #hidden
9. #presentation
10. #panel
11. #recall
12. #bottom
13. #powerpoint
14. #points
15. #speaker
16. #messages
17. #section
18. #screen
19. #stats