title: When should I use OWIN Katana?
body: <p>I am new to OWIN and Katana. I really don't get why I should use OWIN, while I can use <code>IIS</code>. To simplify, my question is: What do I lose if I skip learning OWIN and use IIS for my websites?</p>
  
  <p>I googled but there is not a simple explanation. There is some information <a href="https://stackoverflow.com/questions/18058799/owin-and-katana-why-decouple-the-application-from-the-server">here</a>, but they use some jargon phrases so I cannot understand it.</p>