The Federal Reserve is the nation's central bank. As such, it creates the supply of money by lending it to the banking system, requiring the level of reserves banks must keep on hand, and by regulating the prime interest rate banks charge.
There are several types of banks. Commercial banks are the most common, and include global banks such as Bank of America and Citigroup. Community banks are smaller and focus on local service. Online banks operate over the Internet.
Savings and loans target mortgages. Credit unions are usually restricted to employees of companies or schools. Shariah banking was developed to conform to the Islamic prohibition against interest rates.
In recent years, banking has become very complicated as banks have ventured into sophisticated investment and insurance products. This level of sophistication led to the banking credit crisis of 2008.


