What is MVVM ?

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M->Model
V->View
VM->View Model

MVVM is nothing but architectural pattern used in software engineering.MVVM prescribes separating the nonvisual classes that encapsulate interaction logic, business logic and data from the visual classes that actually render things to the screen. This separation makes the code easier to maintain: first, it prevents the UI from becoming a monolithic class with display controls, interaction logic and business logic all stuffed in side by side; and second, it enables you to automate the testing of interaction logic and user interface mappings instead of relying on expensive, unreliable manual testing. It also helps to facilitate a 'lookless' view, where the visual design can be changed without changing the code.In MVVM, instead of writing C# or Visual Basic code to directly set and get properties of controls in the view, you create a view model which represents the information being presented in the view, and use data binding to keep the view and the view model in sync. 

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