title: How to autoupdate android app without playstore? Like Facebook app or any Contest app
body: <p>How do apps update internally automatically without updating from playstore?
  I mean the internal data of app is changed (via internet) without updating from playstore. For eg any Contest app, or Facebook app. Here the newsfeed is updated automatically.</p>
  
  <p>What is the technical term for that?</p>
  
  <p>Any tutorial on it?</p>