currency
Each country has there own
currency. If you go to the
dollars
pounds
euro
shop and you want to buy something like a banana
you have to pay for it with the country's your in's
currency, let's say you were in England you have to
pay with pounds, but if you were in France or any
other country's in Europe you have to pay in euro's, or if you were in America you have to pay in dollars.
If you were going to a different country like England to Germany you can't pay in pounds in Germany, so how are you going to buy things in Germany? well you have to exchange your money and how are you going to do that? you can either go to the bank, the post office or the currency exchange store and they will give you the currency you will need for your journey.