Central bank - Wikipedia
A central bank, reserve bank, or monetary authority is an institution that manages the currency, money supply, and interest rates of a state or formal monetary union, and oversees their commercial banking system. In contrast to a commercial bank, a central bank possesses a monopoly on increasing the monetary base in the state, and also generally controls the printing of the national currency, which serves as the state's legal tender. A central bank also acts as a lender of last resort to the banking sector during times of financial crisis. Most central banks also have supervisory and regula...