An app that encourages users to share it with their social network is known as a "refer and earn" app. These apps have a referral system that pays users for successfully referrinindi slotsg new users with points, money, or other rewards. A reward is usually given to the referrer only after the person they referred completes a certain task, like buying something or reaching a particular level in a game. Businesses and marketers love refer-and-earn apps because they offer an affordable way to acquire users through word-of-mouth advertising.