What is the difference between the architectural patterns MVC and MVVM?

MVC: Model: Data and business logic. Controller: Handles user input, updates the model, and the view. View: Displays the data from the model. Main drawback: The "fat controller" problem, where the controller becomes too large and complex.

MVVM: Model: Data and business logic. View: Displays data. ViewModel: Represents the model data in a view-friendly format and contains view logic. ViewModel does not have direct access to the View. Data binding: The view binds to the ViewModel through data binding mechanisms (e.g., Binding).

Comparison:

	MVC	MVVM
Responsibility	Controller handles UI and business logic	ViewModel handles view logic and data
Testability	Difficult to test the controller	ViewModel is easier to test
Controller/ViewModel size	Controller can become "fat"	ViewModel is more focused
State management	In controller/model	In ViewModel