This document defines and discusses e-commerce. It begins by defining commerce as the buying and selling of goods, especially on a large scale, between businesses, individuals, and countries. It then defines e-commerce as doing business online, typically via the web, using electronic data transmission over the internet. The document discusses how e-commerce works and the differences between traditional marketplaces and e-marketplaces. It also outlines some of the benefits of e-commerce for businesses, such as reduced costs, lower product cycle times, and faster customer response. Finally, it classifies e-commerce by the nature of transactions, such as business-to-business, business-to-consumer, and consumer-to-consumer.