This document discusses different types of apps that can be created with OutSystems, including traditional web, reactive web, and mobile apps. It explains that reactive web and mobile apps offer a state-of-the-art architecture, the ability to create apps that delight users with a great experience, and a unified developer experience. The document also provides a comparison of traditional web, reactive web, and mobile apps in terms of code reusability, target devices, user experience, performance, access to device capabilities, offline capabilities, deployment and updates, and distribution.