This tutorial provides a comprehensive guide on how to secure a Laravel PHP application with two-factor authentication (2FA) using Twilio's Authy Service. The author, Brian Iyoha, walks through the process of setting up 2FA for a new development project, which includes creating a database, installing the necessary packages, and configuring the Authy SDK. The tutorial also covers how to update the user model, add 2FA logic to the authentication system, send and verify OTPs, and integrate with Laravel's built-in middleware. Additionally, the author provides an overview of the complete source code for this tutorial on GitHub.