This tutorial enables chat functionality in an Angular web application using the JavaScript SDK and the In-App API, allowing users to communicate within the app. To complete this tutorial, a Vonage API account is required, along with basic knowledge of Angular and Node.js. The middleware code from GitHub is cloned and installed, followed by creating an RTC application on the Vonage platform to use within the code. The app creates users and conversations, then authenticates users using the In-App SDK's login method. An Angular service is created to handle data from the middleware, which includes generating a new Angular application with routing, adding Material Design components, and implementing methods for selecting a conversation, sending text, and recreating chat history. The app also features a login component with a form that calls onLogin() when submitted, and a conversation component with a sidenav, conversation members list, and input section to send messages into the conversation. After making these changes, the app can be run at "http://localhost:4200" to see it working.