Node.JS - Builds Scalable Network Programs

Node.js is a server-side JavaScript environment that uses an asynchronous event-driven model. It could handle thousands of concurrent connections. This allows Node.js to get excellent performance based on the architectures of many Internet applications. It is an evented I/O for V8, which is Google's open source JavaScript engine.

Using Javascript in the server and in the browser helps to work in a single programming environment. They could communicate using JSON.