The European Union's main currency is the Euro. All member states have adopted the Euro except for Great Britain and Denmark.
euro
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the euro
EU, I think means euro, like the currency of Europe €
If EU represent EURO currency, the advantage is that in Europe many countries have adopted EU for transactions. Tourists and travellors need not exchange currency.
Hungary joined the EU in 2004, but has not yet joined the Euro currency.
Franks.
The euro is the current Italian currency. Italy is a member of the European Union. Use of the euro isn't a requirement of EU membership. For example, Sweden is an EU member that doesn't use the euro. Italy is an example of an EU member that does.
The biggest savings is in trade between one country and the EU, or between the EU states. Conversion of currency is complex and needs a vast accounting system. Businesses would need to hedge against currencies if they sell products in different countries that use different currencies. One common currency in the EU makes this process much easier. Another advantage to the EU states is the power of their currency as a reserve currency for the world. A currency held by many states is more attractive as a reserve currency as the market for the currency is more liquid.
What was once called the EEC, is now the EU or European Union. The EU has many currencies. 18 of its 28 members use the Euro, but as there are other currencies, neither it nor any others can be said to be the EU currency.
The Euro is the official currency of the European Union, although not all Eu countries use it yet. Its lower denomination is the cent, of which there are 100 to 1 Euro.
Barcelona is one of Spain's major cities and as Spain is a member of the EU, Barcelona's currency is the Euro.