In marketing a coupon's a ticket or document that can be exchanged for a financial discount or rebate when purchasing a product. Customarily, coupons are issued by manufacturers of consumer packaged goods or by retailers, to be used in retail stores as a part of sales promotions. They're often widely distributed through mail, magazines, newspapers, the Internet, and mobile devices such as cell phones. Internet coupons have become popular recently, because there's no postal cost, and the printing… (More on Coupons)