The European Union (EU) is a political and economic union of 27 European countries that aim to promote peace, prosperity, and unity among its members. It was established in the aftermath of World War II with the goal of preventing another devastating conflict in Europe. The EU has evolved over time, starting as an economic community focused on coal and steel cooperation, and gradually expanding to include policies on trade, security, and human rights. The EU has its own currency, the Euro, which is used by 19 of its member states. Through its institutions such as the European Parliament and the European Commission, the EU makes decisions on issues that affect its members collectively. The EU has faced challenges such as Brexit, economic crises, and migration, but continues to work towards a more integrated and cooperative Europe.