title: Unclear about Jquery syntax
body: <p>I know this is a basic knowledge about Jquery but I couldn't find anywhere to search and solve this problem. In my project I have a form and I'm using jquery to reset every input in that form but I couldn't use reset() method like in javascript. I searched and found that in Jquery if I want to reset a form with reset() function, I need to use this <em>$('#form')<strong>[0]</strong></em>. I just really want to know what does it mean when using <strong>[0]</strong>. Thank you very much. 
  EX:</p>
  
  <pre><code>$(function() {
   $('#reset').click(function() {
     $('#form')[0].reset();
   });
  })
  </code></pre>