title: Use of profile attribute in HTML head tag
body: <p>What is the use of profile attributes in the HTML <code>&lt;head&gt;</code> tag? </p>
  
  <p>I happened to read about it in here : <a href="http://www.w3schools.com/tags/tag_head.asp" rel="noreferrer">http://www.w3schools.com/tags/tag_head.asp</a>.</p>
  
  <p>I could not understand this(<a href="http://www.w3.org/2002/12/namespace" rel="noreferrer">http://www.w3.org/2002/12/namespace</a>) either, since it is too technical (for me).</p>
  
  <p>I have never used it. What is the purpose it serves?</p>