What is a widget container?

I have searched about this on the net, but have not been able to find a good explanation.

What is a widget开发者_JAVA技巧 container, why is it used?

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Widget containers are essentially a software abstraction. They used to manage a whole lot of widgets together. As an example, the editor we use here in stack overflow for asking questions and answering them, can be considered as a widget container. It contains several widgets which work together. Some of these widgets are buttons like B I etc, some are text areas.