The official currency in Vietnam is the Vietnamese dong (VND). It's best to exchange some currency at the airport upon arrival or at banks in major cities for the best rates. ATMs are widely available in urban areas, and credit cards are accepted at most hotels, restaurants, and shops in tourist areas. However, it's a good idea to carry cash for smaller vendors and markets. Mobile payment options like GrabPay and MoMo are also becoming increasingly prevalent, especially in larger cities.