Airports and large stations usually have banks and exchange agencies for withdrawals or related services. Banks (with 24-hour ATMs) are located all over the country; you can exchange/buy traveller's checks (in dollars or euros) through banks.
The currency used in Italy is the Euro.
Coin denominations: 1 cent, 2 cents, 5 cents, 10 cents, 20 cents, 50 cents, 1 Euro, 2 Euro.
Banknote denominations: 5 Euros, 10 Euros, 20 Euros, 50 Euros, 100 Euros, 200 Euros, 500 Euros.
In addition to cash, you can pay for your purchases using the most common credit cards, by now customary in Italian commercial activities that usually display the symbols of accepted circuits at the entrance. In major centres, you can also pay using your smartphone and various dedicated apps.