Eurozone

"Eurozone? Well, they never used any currency except the Euro. Unbelievable. Well, I think my country used the won, not the North Korean one, but the South Korean one, yet it sounds confusing as well."

--Su Ji-Hoon, The Ambitions of the European Union

The eurozone, officially called the euro area, is a monetary union of 19 of the 28 European Union (EU) member states which have adopted the euro (€) as their common currency and sole legal tender. The monetary authority of the eurozone is the Eurosystem. The other nine members of the European Union continue to use their own national currencies, although most of them are obliged to adopt the euro in the future.