What is Server layering?

Related questions

1. Is Zul Jin related to Vol Jin?
2. Will sylvanas become the Lich Queen?
3. What happened to Sylvanas?
4. What is classic layering?
5. What is CRZ?
6. How old is Sylvanas?
7. Who is the boss of Bwonsamdi?
8. What is new in Battle for Azeroth?
9. What patch is WOW currently on?
10. How many WoW servers are there?

Tags

1. #guarantee
2. #starting
3. #continent
4. #basically
5. #means
6. #people
7. #servers
8. #instead
9. #zones
10. #answer
11. #sharding
12. #every
13. #layering
14. #rotating
15. #again
16. #shard
17. #blizzard
18. #entire