The document defines electronic commerce (e-commerce) as the buying and selling of goods and services over electronic systems like the Internet. It discusses the history of e-commerce from its origins in EDI and EFT in the 1980s to its growth on the World Wide Web in the late 1990s. The document outlines the main advantages of low costs and 24/7 access and disadvantages of security risks for e-commerce. It also describes the four main types of e-commerce: B2B, B2C, C2B, and C2C and provides examples.