Titanium Mobile allows building cross-platform mobile apps using JavaScript, HTML, and CSS. It simplifies mobile development by using existing web skills. Apps are built natively for iOS and Android and can access useful modules like Maps, Media, and Contacts. The document demonstrates creating a study app prototype in Titanium Mobile in under 24 hours with no prior mobile experience. It discusses the app structure, main components like windows, tabs and tables, and building out specific screens for disciplines, books, chapters, quizzes and feedback.