National banks are financial institutions chartered by the federal government of the United States. They are regulated by the Office of the Comptroller of the Currency (OCC) and must adhere to specific federal laws and regulations. National banks can offer a wide range of services, including accepting deposits, making loans, and providing various financial products to individuals and businesses. These banks are required to maintain certain capital levels and are insured by the Federal Deposit Insurance Corporation (FDIC), which protects depositors' funds. National banks play a crucial role in the economy by facilitating transactions, providing credit, and contributing to the overall stability of the financial system.