Loyalty cards are programs offered by retailers and businesses to reward customers for their repeat purchases. When customers sign up for a loyalty card, they receive points or discounts for every purchase, which can later be redeemed for rewards, such as free products or exclusive offers. This encourages customers to return to the same store rather than shop elsewhere. These cards can be physical or digital, often linked to a mobile app. Many popular retailers, such as Starbucks and Kroger, use loyalty cards to enhance customer engagement and gather data on shopping habits, helping them tailor promotions and improve services.