title: An exact description of a Symfony Bundle in a complex web application
body: <p>I'm new to version 2 of the Symfony framework. I made some projects with v1 but now trying to get my head around the new version and it's features.
  I read over the concept of Bundles but it's purpose is not yet very clear to me.</p>
  
  <p>Say you have a big web application, a CRM for example. How would the bundles look like?
  Would it be NewsletterBundle (for sending newsletters), ContactManagementBundle (for managing contacts), UserBundle (for editing users and their permissions).</p>
  
  <p>Or would it be less cut-up like, EmailBundle (for handling the entire email traffic), CRMBundle (for putting in all your CRM code), PermissionsBundle, ApiBundle.</p>