The official currency of Republic of Turkey is LIRA. All the prices througt out the country are in Turkish Lira. But you may have the prices in different currencies especially in Touristic Sites such as Grand Bazaar, Cappadocia, Ephesus and more.
The sign of Turkish Lira is ₺ and the code is TRY
Smallest note is 5 Lira and the biggest note is 200 Lira. The easiest way to get cash liras is to stick your bank card or credit card into a Turkish ATM (bancomat/cashpoint, cash machine). Here are the photos of Turkish Lira; the currency in Turkey.
Tipping is not mandatory but well appreciated. Generally 10 to 15 percent tip is expected at the service based businesses.