Bank as is understood in general terms is a depositor or lender for the safekeeping of money. With the changing times banks are performing a host of other financial services like insurance, mutual funds, securities, etc. It is important to look at some definitions of banks to understand the concept of bank. "An institution that provides a great variety of financial services. At their most basic, banks hold money on behalf of customers, which is payable on demand, either by appearing at the bank for a withdrawal or by writing a check to a third party. Banks use the money they hold to finance loans, which they make to businesses and individuals to pay for operations, mortgages, education expenses, and any number of things. Many banks also perform other services for a fee; for instance they offer certified checks to customers guaranteeing payment to third parties. In some countries they may provide investment and insurance services. With the exception of Zero Interest based banks, they pay interest on deposits and receive interest on their loans. Banks are regulated by the laws and central banks of their home countries; normally they must receive a charter to engage in business. Banks are usually organized as corporations.Commercial banks are mainly concerned with managing withdrawals and deposits as well as supplying short-term loans to individuals and small businesses. Consumers primarily use these banks for basic checking and savings accounts, certificates of deposit and sometimes for home mortgages.