title: What is a clearfix?
body: <p>Recently I was looking through some website's code, and saw that every <code>&lt;div&gt;</code>  had a class <code>clearfix</code>.</p>
  
  <p>After a quick Google search, I learned that it is for IE6 sometimes, but what <strong>actually</strong> is a clearfix? </p>
  
  <p>Could you provide some examples of a layout with a clearfix, compared to a layout without a clearfix?</p>