The euro is a world currency. It is the official currency of 19 European States, and according to the June 2018 report by the European Central Bank (ECB) on the international role of the euro, it is by far, ahead of the pound, the yen and the renminbi, the world's second most important currency. The euro turned twenty on January 1st. Decided upon with the implementation of the Maastricht Treaty in 1993, its adoption aimed to consolidate the European market and support trade between its members.