A central bank has many functions, but one of its main roles is to perform a supervisory role among all the banks in the country. This means that the central bank regulates and oversees the activities of all other banks in the country to ensure that they are operating in accordance with the laws and regulations set forth by the government. The central bank also monitors the financial health of banks and intervenes if necessary to prevent bank failures and protect depositors' funds. Additionally, the central bank is responsible for implementing monetary policy to achieve macroeconomic goals such as price stability, full employment, and economic growth.