What is FCM registration token?

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Tags

1. #target
2. #commonly
3. #instance
4. #create
5. #initial
6. #google
7. #single
8. #known
9. #cloud
10. #device
11. #token
12. #registrationtoken
13. #client
14. #messaging
15. #groups
16. #startup
17. #devices
18. #generates
19. #registration
20. #access