A központi bank is a national financial institution responsible for managing a country's currency, money supply, and interest rates. It plays a crucial role in maintaining economic stability and implementing monetary policy. Central banks also oversee the banking system and act as a lender of last resort during financial crises. In addition to regulating the economy, a központi bank often issues national currency and manages foreign exchange reserves. It works to control inflation and promote employment by adjusting interest rates and using various monetary tools. Examples of central banks include the Federal Reserve in the United States and the European Central Bank in the Eurozone.