This textbook focuses on the members of the digital value chain for eBusiness and eCommerce and dedicates a separate chapter to each of them: eProducts and eServices, eProcurement, eMarketing, eContracting, eDistribution, ePayment, as well as eCustomer relationship management. In addition to business models and business webs, digital procurement and marketing processes such as electronic negotiation processes, security questions with digital signatures, as well as electronic supplier relationship management and customer relationship management are also addressed. The topics are described using explicit procedures and descriptive examples of their application. A case study describing the gradual creation of an electronic webshop for DVDs is developed over the course of the book. The book is intended for students of economics at universities and technical colleges; it is also suitable for executives, project leaders, and company experts who deal with the digital value chain.