The document discusses Node.js and how it can be used to build server-side applications using JavaScript. Some key points include:
- Node.js allows for non-blocking asynchronous programming which improves performance over traditional blocking servers.
- It uses a single thread event loop model that handles all I/O asynchronously, avoiding context switching.
- JavaScript is the language of the web and Node.js allows using JavaScript on the server side for building real-time applications.
- Node.js has an active community and growing ecosystem of packages on npm that can be easily installed and used in applications.