title: Need clarification RouterModule.forRoot([ ABOUT_ROUTE ], { useHash: true })
body: <p>Kindly explain <code>useHash: true</code> method in angular 2 route method. </p>
  
  <p><strong>My Questions:</strong></p>
  
  <ol>
  <li><p>what is the purpose we using it. </p></li>
  <li><p>why the value is "true" why not "false" ? </p></li>
  <li><p>if the value is false, what could be happen ?</p></li>
  </ol>
  
  <pre><code>RouterModule.forRoot([ ABOUT_ROUTE ], { useHash: true })</code></pre>