Referral program gives you an opportunity to earn money also from the ads watched by your friends.
These commissions depend on a level your referral is on in your structure and are the following:
   Lvl 1 - 8%
   Lvl 2 - 4%
   Lvl 3 - 1%
   Lvl 4 - 1%
   Lvl 5 - 1%

Worth to mention that both your account and account of your referal should be active.
Active account is an account that have min. 50 ads watched during a week.