A smartphone app that rewards users for recommending it to their social network is known as a refer-and-earn app. Referral programs are implemented by these rummy kingdomapps, whereby users get a special code or link to share with others. Points, money, or discounts are awarded to the original user when new users sign up using their referral. In addition to giving people the chance to make extra money through their social networks, this model helps businesses acquire new users.
