This document discusses mobile commerce and digital couponing. It explains that digital sales promotion through mobile coupons is an increasingly popular way for companies to directly interact with consumers. Traditionally, coupons were physical paper tickets that customers redeemed in stores. However, digital coupons can now complete the entire coupon process electronically without any physical paper. Specifically, the document focuses on mobile coupons, which are digital coupons collected and redeemed via consumer mobile devices.