A line of credit is a credit facility extended by a bank or other financial institution to a government, business or individual customer that enables the customer to draw on the facility when the customer needs funds. A line of credit takes several forms, such as an overdraft limit, demand loan, special purpose, export packing credit, term loan, discounting, purchase of commercial bills, traditional revolving credit card account, etc. It is effectively a source of funds that can readily be tapped at the borrower's discretion. Interest is paid only on money actually withdrawn. Lines of credit can be secured by collateral, or may be unsecured.