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The official website (http://www.nodejs.org) defines Node as “a platform built on

Chrome’s JavaScript runtime for easily building fast, scalable network applications.

Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices.”

 In this chapter, we’ll look at these concepts:

 Why JavaScript matters for server-side development

 How the browser handles I/O using JavaScript

 How Node handles I/O on the server

 What’s meant by DIRTy applications, and why they’re a good fit for Node

 A sampling of a few basic Node programs

...Let’s first turn our attention to JavaScript