• NodeJs is primarily used for non-blocking, event-driven servers, due to its single-threaded nature
• It's used for traditional web sites and back-end API services, but was designed with real-time, push-based architectures in mind
• It does offer an asynchronous event-driven JavaScript server-side runtime
• NodeJs is well suited for handling concurrent connections, making it an excellent framework to develop real-time as well as multi-user web apps
• It doesn't support multi-threaded programming yet ; it is able to serve way more complicated applications than Ruby, but it's not suitable for performing long-running calculations or heavy load tasks

• Asynchronous and Event Driven
• Single Threaded but Highly Scalable
• No Buffering - NodeJs applications never buffer any data ; these applications simply output the data in chunks
• Quick execution of code: Javascript is lighweight and fast
• Cross-platform compatibility: NodeJS may be used on a variety of operating systems, being very portable

• Very Fast, built on Google Chrome's V8 JavaScript Engine
• Used for I/O bound Applications, Data Streaming Applications, Data Intensive Real-time Applications, JSON APIs based Applications, Single Page Applications
• Code for large applications may be complex due to the asynchronous nature of NodeJs
• New features are constantly being added to the V8 engine ; generally speaking, expect them to land on a future NodeJs release, although timing is unknown
• NodeJs provides a simple way to list all dependencies and respective versions that ship with a specific binary through the process global object

// Once the NodeJs is installed, create a file named `app.js` containing the following code
// it will start a NodeJS sample app (Hello World) on port 8077 at 127.0.0.1
// to run this application type in a terminal: `node app.js` ; open in the browser: http://127.0.0.1:8077

const http = require('http');

const hostname = '127.0.0.1';
const port = 8077;

const server = http.createServer((req, res) => {
	res.statusCode = 200;
	res.setHeader('Content-Type', 'text/plain');
	res.end('Hello World');
});

server.listen(port, hostname, () => {
	console.log(`Server running at http://${hostname}:${port}/`);
});