This tutorial demonstrates how to build a secure API in PHP using Laravel Passport. It covers the creation of an authentication system, including user registration and login, as well as the management of CEO details. The application uses implicit route model binding, Eloquent resources, and Laravel's built-in validation features to ensure data integrity and security. The tutorial also explains how to install and configure Laravel Passport, generate access tokens for authenticated users, and implement API routes using route model binding. Throughout the tutorial, examples are provided in Postman to demonstrate how to test the endpoints created by the application.