Grocery store loyalty cards are special cards offered by supermarkets that allow customers to earn rewards and discounts on their purchases. When shoppers use these cards, they can accumulate points or receive lower prices on selected items, making their shopping experience more economical. These cards often require customers to sign up, providing basic information like their name and email address. Many grocery stores, such as Kroger or Safeway, use loyalty programs to encourage repeat business and build a relationship with their customers, ultimately benefiting both the store and the shopper.