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Here the gender and interests are selected with radio buttons and checkboxes respectively. They both use the <INPUT> tag with different types. Radio buttons are grouped by using the same name for them. Radio buttons may only have one selected item. The ability to select more than one is where the checkbox comes in.
Gender:The input type of submit creates a submit button that when pressed passes the information to the location in the ACTION portion of the <FORM> tag at the top. The VALUE portion of the submit button tag tells the browser what to display in the button. And ofcourse </FORM> ends the form.