This tutorial demonstrates how to implement instant lead alerts for a fictional real estate agency using Ruby on Rails and Twilio Programmable SMS. The application creates a landing page with a form that users can fill out to request information, and when the form is submitted, it sends an SMS message to a designated real estate agent's phone number with the user's contact information and inquiry details. The tutorial covers setting up the Twilio REST API client, handling incoming lead POST requests, and integrating the messaging functionality into the application.