What is node JS and why use it?

Related questions

1. What is Node JS in simple terms?
2. What is the difference between node JS and express?
3. What is Node JS API?
4. Does node js need a Web server?
5. Is node JS HTTP server?
6. Does react JS need node JS?
7. What is Express node?
8. Is Express js a server?
9. Is Express js a Web server?
10. Which is better node js or react JS?

Tags

1. #blocking
2. #network
3. #javascript
4. #applications
5. #building
6. #event
7. #lightweight
8. #chrome
9. #platform
10. #intensive
11. #driven
12. #built
13. #model
14. #devices
15. #perfect
16. #scalable
17. #across
18. #runtime
19. #makes
20. #distributed
21. #efficient
22. #easily