It is no more a secret that the mobile app is a boon for the businesses could change everything to change everything. However, most of the millennials believe that user acquisition is the only metric that decides the app success. Most of the app owners invest all their capital and effort in alluring the users while underestimating the user engagement. User retention and engagement are two major parameter that keeps your app in the game. If you don’t have the users, who interact with your app regularly then having the large user base will do nothing for you.