A radio button contains more than one radio buttons. All radio buttons have the same name but different ids and values.
The name of the radio button group is use to group the radio buttons.
The first thing that to look at when using radio buttons on our form is how the buttons need to be coded in order for them to function properly as radio buttons.
The desired behavior we want is to have only one button selected at a time; when one button is selected then any previously selected button will be automatically deselected.
So user can't select more than one item from the given radio button group.
Radio button group limits the user selection to a single item.
In order for the person filling out the form to understand what each radio button in our group does, we need to provide descriptions for each button.