The utilization of online services and internet to buy and sell products is known as e-commerce and techniques such as supply chain management, electronic data interchange, mobile commerce, electronic funds transfer, inventory management systems and automated data collection systems are used in electronic commerce. Online auctions, online retailing and electronic markets are its three main areas. Classification in e-commerce can take place in two forms. The first classification is based on the types of goods that are sold such as digital content for online consumption, conventional goods and services, and meta-services for facilitating other types of electronic commerce. The second category depends on the nature of the participant such as B2C, B2B, C2C and C2B. E-commerce has a significant impact upon employment, customers, supply chain management and markets. This book outlines the processes and applications of e-commerce in detail. Most of the topics introduced in this book cover new techniques used in this field. It will serve as a valuable source of reference for those interested in this field.