title: What is the difference of "Notification" and "Push Notification" in Android
body: <p>I want to use <code>Notification</code> in my Android app but I don't know what is the difference between <code>Notification</code> and <code>Push Notification</code> in Android.</p>
  
  <p>I searched the web about this title but all of them talk about differences in apple products.</p>
  
  <p>Can anyone remark where I should use <code>Notification</code> and where I should use <code>Push Notification</code>?</p>