title: What is the difference between callback and promise
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/6801283/what-are-the-differences-between-deferred-promise-and-future-in-javascript">What are the differences between Deferred, Promise and Future in Javascript?</a>  </p>
  </blockquote>
  
  
  
  <p>Can someone point out what are the differences are between callbacks and promises? When should one use promise etc?</p>
  
  <p>Also links on how to create and use promises will be appreciated.</p>