MaterialApp is the starting point of your app, it tells Flutter that you are going to use Material components and follow material design in your app. Scaffold is used under MaterialApp , it gives you many basic functionalities, like AppBar , BottomNavigationBar , Drawer , FloatingActionButton etc.
What is the difference between Scaffold and MaterialApp?
MaterialApp is the starting point of your app, it tells Flutter that you are going to use Material components and follow material design in your app. Scaffold is used under MaterialApp , it gives you many basic functionalities, like AppBar , BottomNavigationBar , Drawer , FloatingActionButton etc.