This tutorial guides developers on how to build a serverless application with React that sends SMS messages using Twilio Programmable SMS and Vercel. The application uses React Hooks to manage state and stores user input in the form fields. It then integrates with a serverless function created on Vercel, which uses the Twilio Client JS SDK to send an SMS message. When the user submits the form, the application sends a POST request to the serverless function, which then creates a new message using the Twilio API. The tutorial concludes by providing ideas for further exploration and development with Twilio API.