Scaffold is a class in flutter which provides many widgets or we can say APIs like Drawer, SnackBar, BottomNavigationBar, FloatingActionButton, AppBar etc. Scaffold will expand or occupy the whole device screen. It will occupy the available space.
Read moreWhat does material app do in flutter?
MaterialApp is a widget that introduces many interesting tools such as Navigator or Theme to help you develop your app. Material is, on the other hand, a widget used to define a UI element respecting Material rules . It defines what elevation is, shape, and stuff.
Read moreWhen should I use material app in flutter?
It gives the constraints to the widget to fit into the screen. It makes the given widget the root widget of the app and other widgets as the child of it. Here we have used the MaterialApp as a root widget in which we have defined the other widgets.
Read more