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Usage guidance, also known as a tag wiki excerpt, is a short blurb that describes when and why a tag should be used on this site specifically.
Earlier money were made from valuable minerals, usually metals like gold, silver or copper. In modern times paper money were introduced (banknotes) and debts can be also represented using other methods of payments, like cheques, bills etc. Electronic money can be used with a credit card or other payment systems like PayPal.
Usually one unit of currency is divided in 100 smaller units.
Use the money tag for questions related to history of money and methods of payment. The tag could be also used for asking for a particular system or currency (eg. British system before 1971).
For specific coins please consider using more appropriate coins tag.