This tutorial teaches how to fetch an Agora token from a web service running an Agora token server using Swift in iOS development. The prerequisites include an Agora Developer Account, basic understanding of iOS development using Swift, the latest version of Xcode, and an Agora token server. The project setup involves pulling the token server into your application and making a request to fetch the token. The tutorial also covers how to stay connected by updating tokens upon expiry. A full example is provided in the GitHub repository for reference.