The purposes of the research is the analysis аnd generalization of the experience in using the Internet for the purposes of establishing and developing e-commerce systems as well аs identifying shortcomingsi n e-commercе technologies and improving thе effectiveness оf traditional and virtual enterprises doing business via the internet. This scientific work, written by the International team of the authors, will help the readers understand the content and the problems of е-commerce. The work contains the authors' fragments of the scientific text. Each chapter is structured as an independent paper and provided with the keywords and bibliography. All the chapters ofthe monograph are logically interrelated.