A discount coupon is a small voucher offering a discount on the price of a product at the time of purchase or for a future purchase. There are two types of discount coupons: those applied immediately at checkout and those valid for later purchases. These coupons can be included in the product packaging, distributed at the entrance or exit of stores, or distributed through various media such as the internet or print media. Often featuring a barcode, the discount coupon facilitates processing at the checkout and allows for evaluation of the promotional campaign’s effectiveness. For more concrete examples of discount coupons, see also: [Add relevant link].