title: What's the meaning of the "row" class in Bootstrap, its difference from containers, and how does it stack with col-***-*?
body: <p>I'm trying to follow the guide here: <a href="http://getbootstrap.com/css/" rel="noreferrer">http://getbootstrap.com/css/</a>
  and I just can't seem to understand what the "row" class is doing. I was trying some of the examples in the guide such as:</p>
  
  <pre class="lang-html prettyprint-override"><code>&lt;div class="row"&gt;
      &lt;div class="col-xs-12 col-md-8"&gt;.col-xs-12 .col-md-8&lt;/div&gt;
      &lt;div class="col-xs-6 col-md-4"&gt;.col-xs-6 .col-md-4&lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>I tried it with the row <code>div</code> and without it, and I was trying to place everything inside a container, and there was no difference at all, they all looked the same.</p>
  
  <p>Could anyone explain what the meaning of the "row" class is ?</p>