This document provides an overview of e-business models and concepts. It compares e-commerce and e-business, describing the four main e-business models: business-to-business, business-to-consumer, consumer-to-business, and consumer-to-consumer. Specific models like e-shops, e-malls, and online auctions are defined. Benefits and challenges of e-business are outlined. The document also briefly discusses mashups and includes opening case study questions.