title: Use ViewModel in case other than Rotation
body: <p>For what other purposes we can use <a href="https://www.google.com/url?sa=t&amp;rct=j&amp;q=&amp;esrc=s&amp;source=web&amp;cd=&amp;cad=rja&amp;uact=8&amp;ved=2ahUKEwi2w7_lhPPtAhW9zzgGHWdCA1EQFjAAegQIBBAC&amp;url=https%3A%2F%2Fdeveloper.android.com%2Ftopic%2Flibraries%2Farchitecture%2Fviewmodel&amp;usg=AOvVaw3f_7HpGuQps9xX6BXFMqhB" rel="nofollow noreferrer">ViewModel</a> for?</p>
  <p>I have been asked if an <em>Activity</em> is locked to portrait mode, then is this relevant to use <em>ViewModel</em>?
  If Yes why?</p>