MVM, or Model-View-ViewModel, is a software architectural pattern used primarily in UI development. It separates the user interface (View) from the business logic (Model) by introducing a middle layer called the ViewModel. This allows for easier management of the application's state and facilitates data binding, making it simpler to update the UI when the underlying data changes. The MVM pattern is commonly used in frameworks like WPF and Xamarin, where it enhances the maintainability and testability of applications. By decoupling the components, developers can work on the UI and business logic independently, leading to more organized and efficient code.