title: What is the difference between form data and request payload?
body: <p>When I send an AJAX Post request and send parameters in queryString in send() method,</p>
  
  <p>Chrome Developer Tool's XHR capture tool shows the parameters under request payload.
  and when I use jquery's post function, 
  The tool shows parameters under Form Data section.</p>
  
  <p>What is the difference ?</p>