This book outlines and analyses some of the most significant features of the European Monetary Union (EMU) and the Euro in the light of the new challenges that the European Union will be called upon to carry out after the renewal of the European Parliament, in an era dominated by a great uncertainty and political, economic and social transformation. With the historical, economic and legal perspectives in mind, the intention of this book is to speculate on the possible futures of the Euro, and to provide not only students, but also a broader general public, with a handful tools of basic information to better understand the function of one of the most relevant results of the European integration process, the Euro.