E-business refers to the use of digital technologies, especially the internet, to conduct business processes such as buying and selling goods, servicing customers, and collaborating with partners. The chapter explains different types of e-business models, including business-to-consumer (B2C), business-to-business (B2B), and consumer-to-consumer (C2C), as well as the role of electronic marketplaces (e-marketplaces) that connect buyers and sellers. It also discusses how organizations use e-busines