What is "radiobutton"

The radiobutton are a GUI element found in many types of forms, both on the web and in standalone applications, and they are used to allow the user to select an option from a set of options.

Where there is a binary choice, it may be better to use a check button. It is often useful to provide some form of visual grouping around a collection of radiobutton, in order to help the user see more clearly what they are choosing between the two. Some types of options may be more suitable for using a combo box element or a drop-down menu element, although the radiobutton have the advantage of allowing the user to view all possible options (and often descriptions of them) at once, which improves the discovery, at a cost of taking up more screen space.

Source: SO-en