What is promise in node JS?

Related questions

1. Why is NodeJS so popular?
2. What is request promise in node JS?
3. Is node js a virus?
4. What is special about node js?
5. What is request in node JS?
6. What is the difference between node JS vs Ajax?
7. What node js is good for?
8. What is API in node JS?
9. What are services in node JS?

Tags

1. #processing
2. #value
3. #function
4. #returned
5. #functions
6. #nested
7. #completion
8. #indicate
9. #promise
10. #promises
11. #generators
12. #asynchronous
13. #callback
14. #mitigated
15. #issues
16. #carried