The document outlines the main institutions and historical development of the European Union (EU), detailing the roles of the European Commission, European Parliament, Council of the EU, European Council, and the European Court of Justice. It highlights that the EU is not a state or federation but a supranational organization with powers delegated by member states, emphasizing the treaties that establish its legal framework. Additionally, the document provides a timeline of key treaties from the establishment of the EU to recent reforms.