The tutorial explains how to create a JavaScript-based chat application that uses audible chirps for connecting users to channels through the Chirp WebAssembly SDK and PubNub JavaScript SDK. It guides users in setting up the project, including creating necessary files and directories, and incorporating the SDKs and necessary HTML elements for a functional chat interface. The application allows users to broadcast and join chats via chirps and includes modals to inform users about connection status and chat options. The tutorial emphasizes the importance of using unique keys from Chirp and PubNub for authentication and suggests hosting the application files on a server due to CORS restrictions, recommending a lightweight server for this purpose.