The euro is the official currency used by many countries in the European Union. It was introduced in 1999 for electronic transactions and became physical cash in 2002. The euro symbol (€) is recognized worldwide, and it helps facilitate trade and travel among member countries by providing a common currency. Using the euro makes it easier for people to buy goods and services across different nations without needing to exchange money. Countries that use the euro are part of the Eurozone, which includes nations like Germany, France, and Italy. This shared currency promotes economic stability and cooperation among its members.