An Android widget that allows scrolling of its only child if it is too big for the screen's visible area.
The ScrollView will have only one direct child at all times (but a View hierarchy can be binded to that only child to allow the use of complex layouts). 
If the child is bigger than the screen, the ScrollView will allow it to be scrolled and will indicate the scrolling capabilities by showing vertical scrollbars.
More information about the ScrollView can be found in the documentation for the class. Image source with overview can find here

 
     
     
     
     
     
     
     
     
     
     
     
     
     
    