A safe deposit box, also known as a safety deposit box, is an individually secured container, usually held within a larger safe or bank vault. Safe deposit boxes are generally located in banks, post offices or other institutions. Safe deposit boxes are used to store valuable possessions, such as gemstones, precious metals, currency, marketable securities, luxury goods, important documents, or computer data, which need protection from theft, fire, flood, tampering, or other perils. In the United States, neither banks nor the FDIC insure the contents. An individual can purchase separate insurance for the safe deposit box in order to cover e.g. theft, fire, flooding or terrorist attacks.