What is WordPress multisite used for?

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Tags

1. #sites
2. #single
3. #installation
4. #version
5. #network
6. #makes
7. #possible
8. #number
9. #dashboard
10. #allows
11. #including
12. #manage
13. #features
14. #multisite
15. #roles
16. #themes
17. #wordpress
18. #under
19. #everything
20. #multiple