The document discusses various HTML form elements including: - The <form> element which is used to create an HTML form for user input. - The <label> element which defines a label for form elements to help screen readers and users click on small elements. - Radio buttons and checkboxes which allow users to select single or multiple options respectively using the <input> element. - The submit button which uses <input type='submit'> to submit the form data to a server-side form handler specified in the form's action attribute.