This tutorial guides developers through building an iOS chat app using Xamarin and Twilio IP Messaging. The first step involves setting up a Twilio account and creating an access token, which is used to authenticate with the IP Messaging service. The developer then adds the Twilio IP Messaging SDK to their project and configures it to work with their app. They create a data source class to manage messages in the table view and implement the necessary interfaces for the chat client. The tutorial then shows how to connect to Twilio IP Messaging, fetch an access token, and join a channel. Finally, the developer adds code to handle incoming messages and creates a functioning chat app.