This document discusses mobile apps versus mobile websites for retailers. It notes that while mobile apps can provide an optimized experience and offline usage, they require more development resources and time than mobile websites. Mobile websites have wider reach since they don't require downloads and can be accessed by more users. The document also stresses that smartphones have a diverse user base, not just younger people, and to consider platforms beyond iPhone like Android and Blackberry. It encourages retailers to start mobile engagement but not be afraid to ask for help from mobile experts.