What is the difference between MVVM and 3 layer architecture?


MVVM has an extra layer as compared to 3 layer architecture. In 3 layer architecture we have UI (view) , business logic ( model) and Data access layer ( DAL). In MVVM we have an extra layer in between view and model i.e. the view model class.
3 layer architecture complements MVVM architecture.

MVVM vs 3-Tier

MVVM vs 3-Tier