This document summarizes key concepts from a textbook on e-commerce business models. It discusses different types of business models for B2C (business to consumer) and B2B (business to business) e-commerce, including portals, e-tailers, content providers, transaction brokers, market creators, service providers, and community providers for B2C. For B2B it discusses e-distributors, e-procurement, exchanges, industry consortia, and private industrial networks. It also discusses how the internet impacts industry value chains, firm value chains, and business strategy.