If you done website programming, you must have used javascript. HTML provides page layout, CSS provides beauty and Javascript makes webpage more interactive. This Javascript runs within browser. Node.js helps to run this Javascript as standalone application
Node.js is an open source server environment.
Node.js allows you to run JavaScript on the server.
https://nodejs.org/en/
Goto the location of the code
npm install -> Install dependency
node index.js -> Run the server
Node.js runs single-threaded, non-blocking, asynchronously programming, which is very memory efficient.
https://www.w3schools.com/nodejs/