A state bank is a commercial financial institution chartered by a specific state government within a federal nation, providing retail and commercial banking services to the general public and local businesses. In contrast, a central bank is the supreme monetary authority of a nation—such as the Federal Reserve in the United States or the Reserve Bank of India—responsible for overseeing the nation's monetary policy, regulating commercial banking systems, issuing national currency, and maintaining macroeconomic stability. State banks operate for profit by taking deposits and making loans, whereas central banks operate as non-profit public institutions tasked with controlling inflation, managing interest rates, and acting as the lender of last resort.