What is the purpose of the Book of Esther?

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1. #reign
2. #should
3. #during
4. #festival
5. #started
6. #about
7. #remember
8. #yearly
9. #celebrated
10. #start
11. #purpose
12. #continue
13. #author
14. #shows
15. #saving
16. #purim
17. #people
18. #xerxes
19. #write
20. #jewish