This tutorial demonstrates how to use the Twilio SMS API with React, a popular JavaScript library for building user interfaces. The tutorial covers the key steps in sending an SMS using the Twilio API from a React app, including getting the account ID, finding available phone numbers, buying a phone number, sending an SMS message, and deleting the phone number. The example code provided shows how to make these API calls from a React callback function, which simplifies the process of integrating with the Twilio API. By following this tutorial, developers can send SMS messages using the Twilio API from their React apps, making it easy to add text messaging functionality to their applications.