A medium of exchange for goods and services. Currency in some form has been a major part of human monetary interactions for the last 3,000 years. It’s money in the forms of paper, coins, or metals (usually issued by a government) that is accepted as a form of payment. A key takeaway of modern currency is that it’s essentially worthless in and of itself. The bills are assigned a value rather than being backed by more “traditional” currencies (eg, gold). Modern currency also has to contend with the emergence of digital (or “crypto”) currency.