title: iPhone: What is a WWDR intermediate certificate?
body: <p>In the Apple Developer Portal, in Certificates, Developer (or Distribution) it says:</p>
  
  <blockquote>
    <p>"If you do not have the WWDR intermediate certificate installed,
    click here to download now."</p>
  </blockquote>
  
  <p>I don't even know what that means. Do I need to download and run that?
  or do I need to only download the current certificate only?</p>