This document discusses different business models for e-commerce. It defines e-commerce as buying and selling goods and services over electronic systems like the internet. The main e-commerce models discussed are business-to-business (B2B), business-to-consumer (B2C), consumer-to-consumer (C2C), and business-to-business-to-consumer (B2B2C). Each model is defined and examples are provided. Additional topics covered include e-commerce vs e-business, drivers of e-commerce, architecture, processes, benefits and challenges. Trends in online business like mobility and social shopping are also mentioned. The document concludes with tips for choosing an effective e-commerce