The euro (€) is the official currency of the European Union (EU) and the cornerstone of the Economic and Monetary Union (EMU). Introduced as an electronic currency on January 1, 1999, and as physical cash on January 1, 2002, it replaced the national currencies of 12 founding member states.
Currently, 20 of 27 EU countries use the euro:
Austria, Belgium, Croatia, Cyprus, Estonia, Finland, France, Germany, Greece, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Portugal, Slovakia, Slovenia, and Spain.
Non-EU users (via formal agreements): Andorra, Monaco, San Marino, Vatican City.
Unilateral adopters: Kosovo, Montenegro.
The ECB, European Commission, and national governments coordinate fiscal policies under the Stability and Growth Pact to ensure sustainable public finances. Exchange rates float freely against the USD, GBP, and other major currencies.
The euro simplifies cross-border commerce, eliminates exchange-rate risk within the zone, and symbolizes European integration—though debates over fiscal sovereignty and asymmetric shocks persist.