Why is node js single threaded?

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Tags

1. #delegated
2. #asynchronous
3. #background
4. #threads
5. #blocking
6. #event
7. #handled
8. #which
9. #single
10. #language
11. #callbacks
12. #different
13. #functions
14. #execute
15. #multiple
16. #threaded
17. #executed
18. #means