The Euro is the official currency of 19 of the 27 European Union member countries and is a major currency used in international financial markets. It is the second most traded currency in the world after the US dollar, and is used to invest in stocks, bonds, commodities, and currencies. The Euro is a stable currency with low inflation and is attractive to investors because of its liquidity and low transaction costs. The Eurozone countries also benefit from having a unified currency, as it allows for easy trade and investment between EU countries. This contributes to economic prosperity and stability in the region.