European Exchange Rate Mechanism

The European Exchange Rate Mechanism (ERM II) is a system introduced by the European Economic Community on 1 January 1999 alongside the introduction of a single currency, the euro (replacing ERM 1 and the euro's predecessor, the ECU) as part of the European Monetary System (EMS), to reduce exchange rate variability and achieve monetary stability in Europe. Following the adoption of the euro, policy changed to linking currencies of EU countries outside the eurozone to the euro (having the common currency as a central point).

Source: Wikipedia — European Exchange Rate Mechanism (CC BY-SA 4.0)