This document provides an overview of e-commerce business models and concepts. It discusses the key elements of a business model, including value proposition, revenue model, market opportunity, competitive environment, competitive advantage, market strategy, organizational development, and management team. Different business-to-consumer and business-to-business e-commerce models are described, such as the e-tailer, community provider, and transaction broker models. The document also covers topics like industry and firm value chains, value webs, and generic business strategies.