Compare between 3-Layer pattern and MVVM

Question

i don\'t know MVVM. i always follow 3-layer patter where one layer is UI, another layer is Business layer and last layer is Data access layer.

in this layer we send requ

Answer 1

MVVM is for building the UI layer. It is a pattern that enables a very nice interaction between your business objects and the UI-framework. You don't have to change your 3-Tier pattern. MVVM is on another abstraction level.
Here you find a very good video introducing MVVM and probably answering a lot of questions.