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What is data binding in MAUI? What is INotifyPropertyChanged and why is it required? How does the CommunityToolkit.Mvvm reduce MVVM boilerplate? What is ICommand and how do commands work in MVVM? How do you implement value conversion in bindings? What are compiled bindings and why use them?
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.NET MAUI › Data Binding & MVVM

What is the MVVM pattern and why use it in MAUI?

Beginner

Answer

MVVM (Model-View-ViewModel) separates the UI (View) from presentation logic (ViewModel) and data (Model). The View binds to the ViewModel, which exposes properties and commands. It improves testability (view models are plain classes), reusability, and lets designers and developers work in parallel. MAUI is built around MVVM.
Real-world example A team unit-tests all screen logic by instantiating view models directly, with no UI or emulator required.

Common follow-ups: How does the View talk to the ViewModel? | What goes in the Model?

MVVM Data Binding & MVVM Testing & Debugging
All 7 Data Binding & MVVM questions