Which currency do 17 members of the European Union share?

The euro is the currency shared by 17 members of the European Union, known collectively as the Eurozone. This currency was introduced to facilitate easier trade and travel between member states by providing a common means of transaction, thus eliminating the need for currency conversion among those countries that participated. The euro aims to stabilize the European economy and strengthen the economic ties among its members, which in turn can enhance economic growth and integration within the region.

The pound, the dollar, and the yen are currencies used in specific countries outside the Eurozone: the pound primarily in the United Kingdom, the dollar in the United States and some other countries, and the yen in Japan. These currencies do not serve as a common currency for the EU members, which is why they are not the correct answers to this question.