The official language of Turkey is Turkish, but English is widely spoken (especially in the tourist and shopping areas). The currency is the Turkish lira. I would strongly suggest converting dollars to lira and investing the time to become familiar with the lira currency. The exchange rate is outrageous and it is quite possible to be short changed both in the conversion of funds in stores and in the making of change. Taxi drivers are notorious for shortchanging/over charging tourist using dollars for payment. This is one country that will require some thought and a calculator to convert currency.