A smartphone app known as "refer and earn" provides incentives for users to share it with their social network. These apps feature a referral system that pays users in dihow to win in slotsfferent ways for successfully bringing new users to the platform—for example, by offering points, cash, or discounts. For signing up using a referral link, the recently referred users are also rewarded. Through the use of word-of-mouth marketing, this marketing technique helps businesses increase user engagement and attract new customers.