The Euro is the official currency of the European Union. It is used by 19 of the 28 European Union countries, as well as other countries around the world. In investing and financial markets, the Euro is an important currency as it provides a stable and consistent means of trading and exchanging value. The Euro is also important for international trade, as it is used as a standard unit of measurement for many commodities, from oil to gold. Additionally, it serves as a benchmark for pricing and trading many financial instruments. As a result, the Euro is a vital part of the global financial system and an important tool for investors.