This document provides an overview of the Model-View-ViewModel (MVVM) design pattern. It defines MVVM as splitting the user interface into three components: the Model contains the application's data; the View displays the data and handles user input; and the ViewModel acts as a mediator between the Model and View. The document discusses WPF concepts like bindings and data templates that enable MVVM. It notes advantages like testability and separation of concerns, and disadvantages like potential overhead. Examples are provided and references for further reading.