The tutorial demonstrates how to create a real-time chat application using React, Material-UI, and the PubNub API. The guide outlines the setup process, including the installation of Node.js, npm, and essential packages, as well as the creation of a PubNub account and obtaining pub/sub keys. It explains the use of React Hooks, such as useState and useEffect, for managing component state and lifecycle, and introduces the creation of custom hooks to simplify code. The app allows users to join channels, send and receive messages in real-time, and navigate through chat history. The tutorial emphasizes the integration of PubNub's infrastructure for fast message delivery and storage capabilities, ensuring the app can handle a large number of users globally. The design uses Material-UI components to enhance the user interface, and the app's functionality is demonstrated with JSX, providing a responsive and modern chat experience.