Node.js Installation and check its working or not

About Node.js:
Theoretically :  

  Node.js is a platform built on Chrome's JavaScript run time for easily building fast, scalable network applications. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices.

As per my Experience:
Node.js is a platform built on Chrome's JavaScript runtime ,which we can use server side.Till now developer uses Javascript as client side .But Node.js will help to write server side programming using Javascript.

Download And Install Node.Js from below link:
http://nodejs.org/download/
Once you install how to check Node.js is working or not
Open Command prompt or Terminal and type "node" and check for ">" console.
Once its showing then cancel the Command prompt or  terminal .

e.g:

After installation if Node.js is not working then:

Set Environment Variable: Click Here To Check set Environment Variable
Variable Name: NODEJS_HOME
Variable Value: C:\Program Files\nodejs or [Path Of the Nodejs installation directory]

Edit Environment Variable [Path]: Append below line
                                               ;%NODEJS_HOME%\;