Is WordPress multisite free?

Related questions

1. How many subdomains can I have?
2. Do subdomains hurt SEO?
3. Should I use multisite?
4. How do I convert a multisite to a single site in WordPress?
5. How do I create a WordPress multisite?
6. Is Weebly really free?
7. What is the difference between subdomain and subdirectory?
8. What is a subdomain example?
9. Does a subdomain need a DNS entry?
10. Is subdomain bad for SEO?

Tags

1. #wordpress
2. #installation
3. #server
4. #network
5. #source
6. #several
7. #successor
8. #introduced
9. #plugins
10. #multisite
11. #multiuser
12. #allows
13. #files
14. #sites
15. #create
16. #residing
17. #themes
18. #websites
19. #sharing