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Introduction
Node JS is a JavaScript runtime which uses a v8 engine. A V8 engine is an open source JavaScript engine written in C++ that takes a JavaScript code and compiles to a machine code. It is used inside of Node JS and inside of a Chrome browser.
Node is a platform to run any JavaScript program outside of any browser.
For plain JavaScript there is a v8 engine installed in chrome browser, and we used to execute the JavaScript programs in chrome. Now the same v8 engine is extracted and wrapped around with a C++ environment and installed inside our system just like any other language and name as node js.
Now we can execute the JavaScript programs just like any other browser.
Ex:
console.log('Hello World');
in the browser, we have a global object like ‘window’ and document to manipulate the DOM on the browser and deal with the dynamic nature of any browser. But here we don’t have window and document objects.
Here we have an object called ‘global’ just like ‘window’ in browser.
Here we have an object called ‘process’ just like ‘document’ in browser.

Why to Use NODE JS
Node js is very popular backend processing logic of any application. The Companies like Netflix , Uber , Walmart uses node js in the production.
Node JS uses a non-blocking IO model of communicating with database and other environments.(This means it’s a Single Threaded and multi tasking IO).
Node JS serves all the requests simultaneously without blocking any other request by using its callback functions of JavaScript.
Node JS is having a largest package ecosystem to make use of third party libraries. And Node JS uses package manager called ‘npm’. This is the world’s largest ecosystem of open source libraries which is used to inject these libraries to our applications.
Almost all kind tasks there are one or other library is available for us in the npm eco system and we can make use of it using the npm package manager.
This is almost like a maven tool for Java Applications.
Using the plain JavaScript we cannot write each and every boilerplate code for each specific task. We can go ahead and search for some of the libraries in npm and if available for our requirement, we can install it and make use of that library in our node js application.
Node JS Fundamentals
Node JS is a runtime environment to run a javascript program outside of a browser. Node js is comes with whole lot of modules to deal with the underlying file system and os and other IO operations.

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