Node.js is an asynchronous, event-driven framework built on top of Chrome's JavaScript engine and designed for creating scalable network applications. I was created with JavaScript plus a some of C/C++ under the hood so that it can do things like interacting with the filesystem, starting up HTTP or TCP and Socket servers and so on. It is non-blocking, so it doesn't make the program wait, but instead it registers a callback and lets the program continue. This means it can handle concurrent operations without multiple threads of execution, so it can scale pretty well.

Full Tutorial at : http://www.codingsavvy.com/2016/02/beginners-step-guide-for-nodejs.html

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