Node.js What is Node.js? Node.js used as back-end (server-side) language in the development. As usual client/user deal with the front end of the applications.There are much process behind that , we call it as back-end.There, we used several languages like Node.js, php and java as server side languages and MongoDB or MySQL as data base. Node.js is an open-source ,cross-platform javascript runtime environment and library for running web applications outside the client's browser.It is a server-side platform built on Google Chrome's javascript engine(V8 Engine).Node.js was developed by Ryan Dahi in 2009 and its latest version is v14.13.0. Node.js applications are written in javascript and can be run within the Node.js runtime on OS X,Microsoft Windows and Linux. Node.js = Runtime Environment + JavaScript Library. Reference ( Simplilearn youtube channel, Node.js documentation)