The Euro is a single currency used by 19 of the 28 countries of the European Union. It is used in financial markets for investing, trading and carrying out monetary transactions. The Euro provides investors with a more stable and efficient way to trade between countries within the European Union. It also acts as a hedge against currency fluctuations, allowing investors to diversify their portfolios and thereby reduce overall risk. Additionally, by using the Euro, investors can benefit from the liquidity and low transaction costs of the largest and most liquid currency market in the world.