title: How this type of links works?
body: <p>I've been working in php for a while and the links that I usually work on are like this :   <em><a href="http://ahmad.com/progress.php?id=6&amp;method=sod" rel="nofollow">ahmad.com/progress.php?id=6&amp;method=sod</a></em>   </p>
  
  <p>but in some websites the links are so much different, they look like something like this : <em><a href="http://ahmad.com/category/main/2015/post" rel="nofollow">ahmad.com/category/main/2015/post</a></em>  </p>
  
  <p>there is lots of" / ", I was thinking that it's may be a folder inside folder but it seems impossible, so I m wondering how this links words?</p>
  
  <p>thanks</p>