The document discusses different models of e-commerce categorized by information sharing, sectors, revenue models, and participants. It describes various e-commerce models including i-commerce, t-commerce, c-business for information sharing; e-government, e-banking, e-education for sectors; advertising, subscription, sales, transaction fee, and affiliate models for revenue; and relationships between government, business, and consumers. Major business-to-consumer models like portals, e-tailers, content providers, market creators, service providers, and community providers are also outlined.