The document provides an overview of QR codes, initially developed by Denso for inventory management in the automotive industry and now widely used across various sectors, particularly in Japan. It highlights the flexibility, information density, and growing global usage of QR codes since their introduction to mobile phones in 2002, including their role in advertising, logistics, and governmental applications. The report also discusses Denso Wave's patents and the importance of QR codes in connecting mobile users to online resources without manual input.