A mobile app with a referral program integrated into it that lets users get compensated for referring others to the app is known as a "refer & earn" app. Usually, prummy wealth 111oints, money, or other incentives are given out for each successful referral. These apps' main objective is to leverage word-of-mouth advertising by motivating users to spread the word about them on social media. Compared to conventional marketing techniques, this tactic helps app developers obtain new users at a lower cost.