This document discusses mobile web and apps, their ecosystem, and security considerations. It begins by defining mobile web and apps, including different mobile platforms. It then outlines the ecosystem involving app stores, developers, networks and users. The document details security aspects of mobile web, such as encryption, authentication and threats. It also covers security of mobile apps regarding app platform guidelines, reviews, permissions and sandboxes. Finally, it presents a "pyramid of safety" involving different levels of security from safe usage to physical security. The overall message is that mobile web and apps will significantly impact experiences and understanding their security is important.