The document provides an overview of mobile codes like QR codes and SMS codes. It discusses how QR codes work, providing examples of best practices for using QR codes in advertising and promotion. Specifically, it shows how QR codes have been used effectively by companies to link to engaging mobile content from print materials. It also outlines some pitfalls to avoid, such as linking QR codes to non-mobile websites or providing dull content that fails to incentivize users. The document aims to educate on using this technology to enhance marketing communications.