In marketing a coupon is a ticket or ocument 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 are often widely distributed through mail, magazines, newspapers, the Internet, and mobile devices such as cell phones. Internet coupons have become popular recently, because there is no postal cost, and the printing cost is borne by the user (who prints the coupons) rather than the businesses issuing them. Mobile coupons have emerged as a new and green alternative as no printing is required whatsoever. Mobile coupons as a method of coupon redemption are gaining in popularity as more consumers utilize their mobile devices for uses beyond voice.