Book excerpt: Since its foundation in 1995, the World Trade Organization, with its extensive legal provisions, has been defining the world trade relations and also had an enormous impact on both European and national economic law. At the same time, the WTO is perceived within the political discussion as a symbol for the world trade relations as a whole, the challenges of globalization and justice of the world trade order. Due to the expansion, consolidation and the increased enforcement of its rules, the relevance of the World Trade Organization will continue to increase. This book describes the institutional system, the basic principles and the vast variety of rules of the World Trade Organization. It aims at clarifying the structures and the general concepts, in order to enable the reader to get a better understanding of the issues at stake in many of the discussions and controversies on world trade.