This document discusses how internet technology supports electronic business and commerce. It describes several internet business models, including virtual storefronts, marketplaces, auctions, and digital product delivery. It also compares categories of electronic commerce such as business-to-business, business-to-consumer, and consumer-to-consumer. Intranets and their applications in functions like finance, human resources, sales and supply chain management are also covered. The document concludes by examining challenges and opportunities of the emerging digital firm.