What is MVVM?

MVVM (Model-View-ViewModel) is a software architectural pattern that facilitates the separation of the development of the graphical user interface (the View) from the development of the business logic or back-end logic (the Model) through a ViewModel. The ViewModel is responsible for exposing data objects from the Model that are easily consumed by the View. The View binds to properties on the ViewModel, which in turn exposes data contained in the Model. This separation of concerns improves testability, maintainability, and reusability of the code.