Node.js is a JavaScript runtime environment that allows you to run JavaScript on the server side. In fact, JavaScript does not have access to anything outside the browser by default. It doesn’t know about files or network connections or anything else. However, we can use other languages like C++ to write code that lets JavaScript do things in ways that are not possible with JavaScript alone, and then we can expose those functionalities to JavaScript as methods, which get executed when called.

Why nodejs? The main advantage of using Node is its efficiency as it never buffers any data. It simply outputs the data in chunks which makes it a better choice to develop data-intensive applications for real-time use cases like online gaming and chat application etc.