The document discusses MEAN, an acronym for MongoDB, Express, Angular, and Node.js. It provides an overview of each component: MongoDB is a document-based NoSQL database that stores data in JSON-like documents; Express is a web application framework for Node.js that provides routing, templating, and other features; AngularJS enhances HTML for building client-side web applications with two-way data binding and templating; Node.js is a platform for building fast and scalable network applications using JavaScript and an event-driven, non-blocking I/O model on the server-side.