title: What is $implicit in angular 2?
body: <p>How is the following keyword used in angular2 ng-templates</p>
  
  <ul>
  <li>What is the purpose of <code>$implicit</code> in angular 2 templates? </li>
  <li>What is relationship between <code>let-&lt;attribute&gt;</code> and <code>$implicit</code>?</li>
  </ul>