Banks are financial intermediaries that collect money from people who have excess funds and use it to provide loans and financing to individuals, businesses, and governments. They also help customers conduct financial transactions, often through an affiliated broker-dealer and/or wealth management division.

　　Broadly speaking, banks in the United States fall into two categories: commercial banks and investment banks. Commercial banks offer savings, checking, and lending services, and they are usually regulated by the Office of the Comptroller of the Currency (OCC). Investment banks help corporations and governments raise money through stocks and bonds, and they are usually regulated by the Securities and Exchange Commission (SEC).

　　Banks that are part of the Federal Deposit Insurance Corporation (FDIC) system pay premiums into the FDIC. In return, the FDIC insures depositors up to $250,000 in the case of a bank failure. The Federal Reserve also has regulatory oversight duties for banks as well as “nonbank financial intermediaries.” The Fed is responsible for checking and maintaining the overall safety and soundness of the banking system. It conducts audits and stress tests designed to ensure the entire financial ecosystem is prepared for a potential crisis.

　　Commercial banksCommercial banks are the most common type of banks. They serve businesses and consumers in two ways:

　　Retail services. Banks provide services to individual consumers and small businesses. They offer basic financial products such as checking and savings accounts and certificates of deposit (CDs), personal loans, mortgages, and credit cards. Retail banks typically have a wide network of branches and automated teller machines (ATMs) for easy access to their services. Some operate entirely online.Business services. Commercial banks primarily serve businesses, corporations, and large institutions. They offer a range of financial services tailored to the needs of businesses, including business loans, lines of credit, cash management, and treasury services. Commercial banks also provide services like payroll processing, merchant services, and foreign exchange.The largest commercial banks are known as money center banks. These operate in such global financial capitals as New York, London, and Tokyo. Money center banks provide a wide range of financial services, including commercial banking, investment banking, asset management, and international banking. Money center banks typically have extensive international operations and serve multinational corporations, governments, and institutional clients such as hedge funds, private equity groups, and venture capitalists.

　　Investment banksInvestment banks are financial institutions that work with large investors, corporations, and governments. They work in the capital markets (primarily stocks and bonds) to connect investors to companies and governments that need to raise money. They also provide corporations with advisory services on corporate strategy, mergers, and acquisitions.

　　Many investment banks also have broker-dealer operations, meaning they buy and sell securities on behalf of customers (many of them institutional clients), as well as for the bank’s own account.

　　In the United States, the primary regulator for investment banks is the SEC, but some investment banking activities fall under other regulators, such as the Federal Reserve System. Some investment banks also hold commercial banking charters, so they are subject to those regulations as well.

　　Other types of banksMany nonfinancial organizations that connect people with a surplus and people with a need call themselves banks, such as food banks and blood banks. But there are two more categories of organizations that use the word “bank” and operate in the financial system:

　　Savings banks. Savings banks, or thrift institutions, focus on promoting savings and homeownership. They usually concentrate on a particular community and have few branches. From a regulatory perspective, they are virtually the same as commercial banks. Land banks. These are government entities or public-private partnerships that acquire vacant, abandoned, or tax-delinquent properties within a community. They work to make the properties safer and salable through demolition, rehab, and redevelopment.The bottom lineOn a simple level, banks connect people who have assets to lend with people who need to borrow assets to fund purchases—from mortgages and auto loans to multibillion-dollar strategic acquisitions. In the United States, commercial banks collect deposits and issue loans, while investment banks facilitate capital formation and other financial transactions.