"1 ευρώ" refers to the currency unit of the Eurozone, which is used by 19 of the 27 member countries of the European Union. The euro was introduced in 1999 for electronic transactions and became physical currency in 2002. It is symbolized by "€" and is divided into 100 cents. The euro is important for trade and travel within Europe, making it easier for people to exchange money and conduct business across borders. It is managed by the European Central Bank, which aims to maintain price stability and support economic growth in the region.