This document discusses various aspects of e-commerce. It begins by defining e-commerce as buying and selling of information, products, and services over computer networks. It then contrasts traditional commerce with e-commerce and discusses the importance of e-commerce, including enabling new business opportunities and customers, improving transactions, and increasing revenue. The document also covers mobile commerce (m-commerce), e-trading, e-business models and activities, and different types of e-commerce such as business-to-consumer, business-to-business, and business-to-government.