A staple in Flutter interview questions for experienced, be prepared to answer this one.   View, Interactor, Presenter, Entity, and Router. You can explain each one of them as following: The user interface or UI is called the View. This is consistent with a view.  A class called the Interactor acts as a go-between for the presenter and the information. It follows the presenter's instructions.  The "traffic cop" of the architecture is the Presenter. By taking user actions and invoking the router to move the user between views, it directs the data between the view and interactor.  Application data is represented by an Entity.  The Router controls screen switching.  The V.I.P.E.R pattern architecture is different from the usual model view architecture where we have full model data and view uses the data (also business logic uses the data). The full application object is in the memory. There is no application object in mobile development like other desktop-based applications.