Radio buttons are just like checkboxes except that they do not allow more than one option to be selected. Again these are created with the <input> tag, this time with TYPE=”radio.” Giving multiple buttons the same NAME will again define a single form field, but selecting different buttons will deselect previously selected buttons. Again be sure to include VALUE attributes.
For example:
My affiliation is: <br>
<input type="radio" name="affiliation" value="faculty"> Faculty <br>
<input type="radio" name="affiliation" value="staff" checked> Staff <br>
<input type="radio" name="affiliation" value="student"> Student <br>
<input type="radio" name="affiliation" value="other"> Other <br>
Produces the following form. Try selecting different buttons to see how this differs from the first example.
My affiliation is:
Faculty
Staff
Student
Other