title: Most common use cases for in order traversal, pre order travsersal and post order traversal
body: <p>I know the definitions of :</p>
  
  <ol>
  <li>Pre order travesral</li>
  <li>In order traversal </li>
  <li>Post order traversal </li>
  </ol>
  
  <p>But I would like to know what are the most common uses cases of all the above three different types of traversal for a BST(Binary search tree) .</p>