The class Container is the superclass of all the classes designed to provide a GUI.

Container

An object used to hold and organize multiple elements, typically allowing for storage, retrieval, and manipulation.

Superclass

The class from which a subclass inherits features such as methods and variables in object-oriented programming.

GUI

Stands for Graphical User Interface, a visual way of interacting with computers using items such as windows, icons, and buttons, opposed to text-based interfaces.