The currency in France is the Euro (€). Credit and Debit cards as well as cash are the best forms to use when traveling in Europe. There are many ATM available throughout the country. The US Banks can frequently provide the best exchange rates, just be sure to verify the charge and international transaction fees. I also like to advise my tour clients to get prepaid travel cards from major banks as they too have the safety and security of being replaced if lost or stolen. I always encourage my clients to have at least $100 in local currency so that you will not be an obvious victim of thieves who stalk ATM machines at airports, hotels and train stations for their next targets. Also I always carry a little coin purse, as small denominations of Euros € are in change.
Tip: Pin numbers are only 4 digits in French ATMs.
Major Tip: Most Metro machines require a credit card that has a smart chip (for security) in it and American cards frequently do not. If you do find that you need to purchase tickets and haven’t any €, you will need to go to a station with a cashier to handle your transaction for you.