what is the use of $index in angularjs?
<p>What is the exact use of $index in angularjs.I have little confusion with using $index in angularjs</p>

<pre><code>&lt;div class="row review" ng-show="mode=='review'"&gt;
    &lt;div class="col-sm-4" ng-repeat="question in questions"&gt;
        &lt;div ng-click="goTo($index + 1)" class="{{ isAnswered($index) == 'Answered'? 'answered': 'not-answered' }}"&gt;{{$index + 1}}. {{ isAnswered($index) }}&lt;/div&gt;
    &lt;/div&gt;
&lt;/div&gt;
</code></pre>