This chapter provides an overview of the Court of Justice of the EU. The Court has emerged as a powerful player in the history and development of the European integration process. Its contribution to the workings of the EU and our understanding of it are central to both legal and political accounts, while its decision-making has at times been controversial. This chapter explores the history of the court as an institution of the EU, its composition, and how it has developed its role. It considers how we can understand the ‘politics’ of the judicial arm of the EU’s institutional framework and also discusses the ‘activism’ of the Court.