The local currency is Vietnam Dong (VND).
Only change money at official money exchange counters with a clear sign showing this status. Changing money elsewhere is illegal and while higher rate may be on offer you may risk losing your money.
Credit cards are widely accepted, but outside main centres you may find cash the only acceptable currency. It may be difficult to cash travellers’ cheques.
ATMs are widely available in major cities and tourist areas.
You can have funds transferred to Vietnam via international money transfer companies like Western Union or Moneygram.