This chapter will cover different aspects of online markets and online marketing in the business-to-business (B2B) environment. It will provide an overview of the essentials of e-commerce in B2B markets. The focus will be on Internet marketing issues and the coverage will span B2B goods and services. Other topics in the chapter include Electronic Data Interchange (EDI), B2B exchanges, Internet-Enabled Service Innovations (IESIs), Internet-enabled hybrid offerings, and international e-commerce. The chapter will present the major B2B e-commerce theories and frameworks, summarize the current knowledge base in B2B e-commerce and the opportunities for further research on the topic.