Is callback function asynchronous?

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Tags

1. #always
2. #functions
3. #taking
4. #requires
5. #hooking
6. #takes
7. #asynchronous
8. #synchronous
9. #javascript
10. #around
11. #calling
12. #function
13. #passing
14. #foreach
15. #example
16. #doesn
17. #callback
18. #event