Refer and Earn applications have become increasingly popular in recent years as a way for users to earn rewards and as a marketing tactic for businesses looking to expand their clientele. These apps work by giviroally rummyng users a special link to recommend someone to their social networks. Both the referrer & the new user receive rewards—which could be in the form of money, discounts, or other incentives—when they sign up using this link. Customers and businesses alike gain from this system. Cost-effective word-of-mouth marketing helps businesses attract new clients, and users can get compensated for just sharing their referral link.