title: <header> vs. <head>
body: <p>In this tutorial: <a href="http://railstutorial.org/chapters/filling-in-the-layout#top" rel="noreferrer">http://railstutorial.org/chapters/filling-in-the-layout#top</a></p>
  
  <p>There is "header"</p>
  
  <p>I know that in HTML there is "head"</p>
  
  <p>But, what is <code>&lt;header&gt;</code> ?</p>
  
  <p>Thanks.</p>