title: Sling models vs WCMUSEPOJO
body: <p>I need an understanding of what wcmusepojo and sling models mean?
  I mean I've read that these implementations are to bring together your component and the back-end implementation but what exactly is done in these (wcmusepojo and sling models) vs what is done inside a component sightly code?</p>
  
  <p>Also what is the difference between using wcmusepojo and using sling models? </p>