title: What is the difference between bans and purge in varnish http-cache
body: <p>Hi i'm a newbie in Varnish HTTP-Cache. I find it hard to understand the difference in concept between purging and banning cache invalidation.</p>
  
  <p>Anyone who can explain and differentiate banning and purging in varnish http-cache?</p>
  
  <p>Anyone? Thanks!</p>