Through referral marketing, the Refer & Earn app is a mobile application that encourages user growth. An exclusive referral code is given to users, who can share it with their social media connections. 777 .inThe referrer gets paid a bonus or incentive when a new user registers with this code. Through successful referrals, users can earn money, and the app grows its user base naturally through word-of-mouth marketing. This arrangement is advantageous to both app developers and users. With the app's simple and approachable interface, users can leverage their current social networks to generate extra cash.