The toolkit itself is a piece of software that is generally provided with an operating system, windowing system, or window manager which provides programs with an application programming interface (API), allowing them to make use of widgets. Each widget facilitates a specific user-computer interaction, and appears as a visible part of the computer's GUI.
Widgets that are provided by a toolkit typically adhere to a unified design specification, including aesthetics, to lend a sense of overall cohesion among various parts of the application and between various applications within the GUI.
Widget toolkits also contain software to assist in the creation of window managers, as windows themselves are considered widgets. Some widgets support interaction with the user, for example labels, buttons, and check boxes. Others act as containers that group the widgets added to them, for example windows, panels, and tabs.
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