“The Key to European Union” is a simplified version of the 8th edition of the well-known book of Dr Nicholas Moussis: Access to European Union: Law, Economics, Policies. That book has been translated into several European languages including French, Italian, Greek, Swedish, Portuguese and Chinese. This book examines the policies developed by the European Union in all fields. These policies influence the national policies of the Member States of the Union and through them affect the lives of their citizens. It therefore becomes all the more important for European citizens to understand the policies of the Union. Thanks to its clear and systematic approach, The Key to EU guides the reader through the maze of European Union policies.