The European Union (EU), headquartered in Brussels, Belgium, developed from the European Community (also known as the European Common Market), and mainly experienced three stages: the three-nation economic union, the European Community and the European Union. In fact, it is a regional integration organization that integrates political and economic entities and has important influence in the world. The EU has 27 member States, and its purpose is "to strengthen the coordinated development of economy and society by establishing a space without internal borders, to establish an economic and monetary union that will eventually implement a unified currency, to promote the balanced economic and social development of member States" and "to promote the EU's personality on the international stage by implementing common foreign and security policies". Main activities 1. In terms of internal construction, the EC has implemented a series of common policies and measures. (1) realize customs union and common foreign trade policy; (2) Implementing the common agricultural policy; (3) Establishing a political cooperation system; (4) basically build an internal unified market; (5) establishing political alliance; (2) In terms of foreign relations, the European Community has established and developed relations with many countries and regions in the world. . Related knowledge 1. Main EU publications: official EU magazines, monthly EU magazines, European literature, European news-diplomatic relations and European economy. 2. EU flag: officially hoisted on May 29th, 1986. The flag has a sky blue background and 12 golden stars on it, representing the halo of Athena in Greek mythology. The purpose of making the Olympic flag is to show that we want to build a unified Europe and enhance people's impression of the EU and their sense of European identity. 3. The emblem of the European Union: 1988 1,1was put into use in October. The bottom of the emblem is blue, with 12 stars in a circle, and the names of member countries are in the middle of the circle. 4. The Union Song of the European Union: Ode to Joy in Beethoven's Ninth Symphony. 5. Inscription of the European Union: Pluralism and Unity 6. EU Celebration Day: May 9th is the "Europe Day" every year. 7. Euro, the unified currency of the European Union.