What is the difference between GCD and Nsoperationqueue?

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Tags

1. #enables
2. #model
3. #abstraction
4. #instances
5. #developers
6. #encapsulated
7. #queues
8. #built
9. #nsoperation
10. #tasks
11. #concurrently
12. #other
13. #nsoperationqueue
14. #execute
15. #class
16. #level
17. #queue
18. #operation