title: Examples of URI, URL and URN
body: <p>I have read many articles about <strong>URI</strong>s, <strong>URL</strong>s and <strong>URN</strong>s, but I don't understand the diff in real examples.</p>
  
  <p>Could you take a few examples of <strong>URI</strong> and <strong>URL</strong>?</p>
  
  <p>I think <code>http://stack.com/first/index.html?submit=yes&amp;action=go#second</code> is URI, not URL, yes?</p>
  
  <p>Then <code>http://stack.com/first/index.html</code> is URL, because it's not so specific?</p>
  
  <p><a href="https://i.stack.imgur.com/2iD7U.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/2iD7U.jpg" alt="enter image description here"></a></p>
  
  <p>Is this image is correct?</p>