This document discusses the benefits of referral marketing programs for driving customer acquisition, retention, and sales. It notes that referral marketing is underutilized by many digital marketers despite evidence that people are more likely to buy from and remain loyal to brands they hear about from friends. The document then provides examples of how to configure a referral program through tools that locate advocates, empower referrals, and reward loyalty. It outlines common analytics from referral programs and how referrals fit into an overall digital marketing strategy at lower customer acquisition costs than traditional channels. Finally, it gives best practices for designing a successful referral program.