Frame (GUI)
Encyclopedia
A frame, or group box, is a type of box within which a collection of Graphical User Interface
Graphical user interface
In computing, a graphical user interface is a type of user interface that allows users to interact with electronic devices with images rather than text commands. GUIs can be used in computers, hand-held devices such as MP3 players, portable media players or gaming devices, household appliances and...

 widgets can be grouped, usually because the designer of the form believes the grouping looks better than leaving the items outside of a frame, or uses a frame to allow multiple uses of a widget which otherwise can only be used once (such as a checked radio button).

In HTML
HTML
HyperText Markup Language is the predominant markup language for web pages. HTML elements are the basic building-blocks of webpages....

 (where frame has another meaning, referring to an individually scrollable portion of a page), this kind of grouping box is called a fieldset after the HTML element of the same name.

In the image to the left, the top frame has no title. The two frames below have titles, and a radio button outside of them, presumably to select one or the other. The lower of the two boxes is dimmed, or disabled, indicating its widgets cannot be selected. Note that each of the frames (as well as the area outside of the frames) has a checked radio button, while normally only one of the buttons can be selected.

Note that any widget, including nested frames, can be placed inside of a frame, not merely radio buttons.
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