What is MVVM in WPF?

When you are planning to make applications in WPF, then you need framework named Model View View Model or MVVM. It is same as the MVC framework and has a 3-tier architecture with one more layer. We can do loose coupling using MVVM.

MVVM was originally introduced by John Gossman in the year 2005 specifically for use with WPF as a concrete application of Martin Fowler’s broader Presentation Model pattern. The implementation of an application, Based on the MVVM patterns the implementation of an application uses different platform capabilities that are available in some form for WPF, Silverlight Desktop/web, and on Windows. Many commercial applications, including Microsoft Expression products, were built following MVVM.