Mobile apps known as "refer and earn" apps provide incentives for users to share the app with their social network. These applications use referral schemes in which users are giveold video game downloadn a special code or link to distribute to other users. Points, money, discounts, or other incentives are given to the referring user when new users sign up using this referral information. Companies in a variety of sectors, such as ride-sharing, food delivery, finance, & e-commerce, use this marketing technique to grow their user base at a reasonable cost.