What is the difference between MMO and RPG?

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Tags

1. #multiplayer
2. #belong
3. #online
4. #simultaneously
5. #games
6. #massively
7. #difference
8. #genre
9. #players
10. #between
11. #playing
12. #mmorpg
13. #played
14. #large
15. #mmorpgs
16. #number