The European Union is an economic and political union of 27 member states located primarily in Europe. It operates through supranational institutions and intergovernmental decision making between member states. The EU has developed a single market through standardized laws across members and abolished passport controls between most members. It aims to ensure the free movement of goods, capital, people and services. The EU is also home to a monetary union called the Eurozone composed of 17 members using the euro as currency.