Although Romania is an EU member, the official Romanian currency is the Leu (lei), with the international abbreviation RON. It is valued at €0.2 – 0.3.
The Romanian currency cannot be bought from abroad, so if you want to exchange foreign currency in RON it is best to find a local exchange office or a bank that displays 0% commission. In general, exchange offices located at the airport or near railway stations offer lower exchange rates, and usually, it’s better to exchange currency at exchange offices rather than banks.