This document discusses the Model-View-Controller (MVC) software architecture pattern. It defines real MVC as separating an application into three interconnected parts: the model, the view, and the controller. The model manages the application's data logic and business rules. The view is responsible for displaying data. The controller handles user input and interaction by collecting information from the user to update the model and pass data between the model and view. The document provides examples of implementing MVC in PHP and notes there is a difference between a real and fake MVC implementation.