MVVM Elements in WPF

Introduction

The MVVM pattern includes the following:

Model. The model represents the underlying, logical structure of data in a software application and the high-level classes associated with it. This object model does not typically contain any information about the user interface.
View. A View is typically some form of user interface element that lets users interact with the application. In a Windows Presentation Foundation (WPF) or Silverlight application, typically each view is composed of an Extensible Application Markup Language (XAML) file and its corresponding code behind.
ViewModel. The view model is an intermediate class between the view and the model. It references the model and calls methods on the model to retrieve domain objects, which are typically exposed to the view as a flat set of properties. The communication between view and view model should be purely through data binding.