A coupon is a ticket or document that can be exchanged for a discount or rebate when purchasing a particular product. They are often widely distributed through mail, magazines, newspapers, the Internet, and mobile devices such as cell phones. Share of coupons in the Internet have become popular recently, because there is no postal cost. However, the printing cost is borne by the user rather than the businesses issuing them. When you share coupons you too can get something in return for sharing it. Usually, coupons are issued by manufacturers of consumer packaged goods to be used in retail stores as a part of sales promotions.