How did the union change the currency of Europe Did all countries change?

The introduction of the euro, established by the European Union, aimed to create a unified currency for member states, facilitating easier trade and travel. While many countries adopted the euro as their official currency, such as Germany, France, and Italy, not all EU nations did; notable exceptions include the UK, Sweden, and Denmark. These countries opted to retain their national currencies, reflecting varying economic conditions and public sentiment towards euro adoption. Overall, the euro significantly impacted economic integration in Europe, but the extent of its adoption varied across the continent.