Node JS is a runtime environment for executing JS code.It is great for prototyping and agile development.Mainly node js used to create web servers.Node js is an open source and cross platform.Node js built on the fastest JS engine of google chrome namely V8. Here I want to share something related to my previous point Actually JavaScript code can only execute in browser.It means something that happened inside the browser to execute.Yes really every browser has a js machine to convert the JS code TO machine code. Microsoft explorer - Chakara Firefox - Spider monkey Google chrome - V8 and also because of this process javascript code shown different output in different browser. Outstanding because of its features 1.Fast 2.Simple 3.A huge number of libraries 4.Asynchronously programming, 5.Highly scalable continue with each chapter