Refer & earn apps are online communities that provide incentives to users who bring in new members. Businesses use this marketing tactic to reach a wider audience and boost user involvement. Simple referral codes rmmyare given to current users, who then share them with their social network. The referrer receives a reward—which could be points, discounts, cashback, or other advantages—when a new user registers using this identification. The fact that these apps are advantageous to both parties makes them widely used. Sign-up bonuses and other incentives are frequently given to new users, & referrers are paid for growing the user base.