title: What is a .ctp file used for in CakePHP?
body: <p>I'm starting to use CakePHP, and I'm in the process of reading the <a href="http://book.cakephp.org/view/57/Controller-Methods" rel="noreferrer">manual</a>. About halfway down the page, there's this comment:  </p>
  
  <pre><code>// Render the element in /views/elements/ajaxreturn.ctp
  </code></pre>
  
  <p>So a very simple question: what's the .ctp extension refer to?  What's the general use case?</p>
  
  <p>Thanks.</p>