when i submit form in html page reload code example

Example 1: submit() refreshes the page

<form onsubmit="return false;">Form stuff in here</form>

Example 2: why does my page reloads on form submission

//jquery method //
//preventDefault() prevents the submit button
//from performing its default task like page reload  
  $('#form').submit(function (e) {
      e.preventDefault();
  });