The euro is the official currency used by many countries in the European Union. It was introduced in 1999 and is symbolized by € and the code EUR. The euro helps facilitate trade and travel among member countries by providing a common currency, making it easier for people to buy goods and services without needing to exchange money. Countries that use the euro are part of the Eurozone, which includes nations like Germany, France, and Italy. The euro is one of the most widely used currencies in the world, and its value can fluctuate based on economic conditions and market demand.