The document discusses how to build information systems using the MERN stack, which includes MongoDB, Express, React, and Node.js. It describes using Node.js for backend logic and the Express framework for routing. Mongoose is used as a wrapper for MongoDB. React is used for the front-end web app and Redux manages global state. React Native is employed for mobile apps. The API is built with Node.js and exposes endpoints that return JSON. It allows building web apps, mobile apps, and integrating with third party systems.