Euro (EUR) explained: the single currency definition
By Ken Chigbo, Founder, KenMacro. Published 2026-05-13.
Quick answer
The euro (EUR) is the official currency of 20 European Union member states that form the euro area. Issued by the European Central Bank and circulated since 1999 in scriptural form and 2002 in cash, it is the second most traded and second largest reserve currency globally after the US dollar.
What is euro?
The euro is the single currency shared by 20 of the 27 European Union member states, collectively known as the euro area or eurozone. It was introduced in scriptural form on 1 January 1999 and entered physical circulation on 1 January 2002. Monetary policy for the euro is set by the European Central Bank in Frankfurt, while banknotes are issued by the Eurosystem, which comprises the ECB and the national central banks of the euro area. The ISO 4217 code is EUR and the symbol is €. The euro is used daily by roughly 350 million Europeans.
How traders use euro
Retail and institutional desks treat the euro primarily through EUR/USD, the most liquid currency pair in the world by daily turnover. The pair anchors most macro flow during the London session, when liquidity and tightest spreads typically appear. Traders price the euro off ECB policy decisions, eurozone HICP inflation prints, the Ifo and ZEW sentiment surveys, and quarterly GDP releases from Eurostat. Cross pairs such as EUR/GBP, EUR/JPY, and EUR/CHF are used to express relative European policy divergence without dollar exposure. Reserve managers hold roughly a fifth of global FX reserves in euros, so sovereign rebalancing flows matter. The desk also watches Bund yield spreads against Treasuries, since rate differentials remain a structural driver of EUR/USD direction.
Common misconceptions about the euro
First, the euro area is not the same as the European Union. Seven EU members, including Sweden, Poland, and Denmark, retain their own currencies. Second, the ECB does not directly issue banknotes alone; the Eurosystem of national central banks distributes them under ECB authorisation. Third, the euro is not a single sovereign currency in the fiscal sense: each member state issues its own debt, which is why peripheral spreads over German Bunds remain a key risk indicator. Finally, ECB policy is set by the Governing Council, not by Germany or France individually, despite their economic weight.
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Frequently asked
Which countries use the euro?
Twenty European Union member states use the euro: Austria, Belgium, Croatia, Cyprus, Estonia, Finland, France, Germany, Greece, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Portugal, Slovakia, Slovenia, and Spain. Croatia joined most recently on 1 January 2023. Several microstates including Monaco, San Marino, Vatican City, and Andorra also use the euro under formal monetary agreements with the EU, while Kosovo and Montenegro use it unilaterally.
Who controls the euro?
Monetary policy for the euro is set by the European Central Bank, headquartered in Frankfurt. The ECB Governing Council, which includes the six members of the Executive Board and the governors of the 20 national central banks of the euro area, decides interest rates and asset purchase programmes. Day-to-day implementation, banknote distribution, and supervision of significant banks under the Single Supervisory Mechanism are carried out jointly by the ECB and national central banks within the Eurosystem framework.
Why is EUR/USD the most traded forex pair?
EUR/USD links the two largest reserve currencies and the two largest economic blocs by GDP, generating enormous trade, investment, and reserve flows. The Bank for International Settlements Triennial Survey consistently shows EUR/USD accounting for the largest single share of global FX turnover. Deep liquidity, tight spreads, transparent central bank communication from both the Fed and ECB, and overlapping London and New York trading hours make it the default benchmark pair for institutional and retail participants alike.
Is the euro a reserve currency?
Yes. The euro is the second largest reserve currency in the world after the US dollar, according to the IMF COFER data on allocated foreign exchange reserves. Central banks, sovereign wealth funds, and supranational institutions hold euros as part of diversified reserve portfolios. Its share has fluctuated over the past two decades but has generally remained the clear runner-up to the dollar, well ahead of the yen, sterling, and renminbi.
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