What is actor in use case diagram?

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Tags

1. #specifies
2. #stakeholder
3. #interacts
4. #primary
5. #other
6. #actors
7. #subject
8. #writing
9. #system
10. #actor
11. #further
12. #follows
13. #services
14. #alistair
15. #calls
16. #cases
17. #defined
18. #cockburn
19. #deliver
20. #played
21. #effective