The Croatian currency is the Kuna.
1 Kuna is divided into 100 lipas. The word "Kuna" means marten, a weasel-like animal, whose fur Croats used for payment many centuries ago. When listed as a price, the Kuna is abbreviated to Kn.
The Kuna comes in dominations of 5, 10, 20, 50, 100, 200, 500 and 1,000 as notes and 1, 2, 5, 25 as coins. The Lipa comes in coins of 1, 2, 5, 10, 20 and 50.
ATMs / cash machines
ATMs are readily available in all resorts, towns and cities in Croatia, in banks, supermarkets, airports and elsewhere. As a foreign card is inserted into the machine, you will most likely be presented you with a choice of languages – no need to navigate through Croatian-language menus! The exchange rate you'll receive will be fairly good, and there may only be a small service charge, which depends on your bank back home.
There are numerous places to exchange foreign currency (including Post Offices), all offering similar rates. Exchange offices charge a commission but some banks do not.