The use of refer-and-earn applications by businesses to reward current users while attracting new ones has grown in popularity in recent years. By giving users a special referral link to share with their social networkall rummy apps, these applications work. The referrer earns a reward—cash, gift cards, discounts, or other incentives—when new users register or make purchases using this link. Businesses and consumers alike gain from this model since it expands the market and gives consumers the chance to receive incentives for little work. The simplicity & effectiveness of refer and earn apps have made them a successful marketing tool across various industries.