That is what makes it different from other assets like stocks, bonds, land, or buildings. A medium of exchange is anything that is generally accepted as payment for goods and services. When we used corn, salt or spices that is commodity money. Commodity money is when something is a consumable item as well as a medium of exchange. The earliest money was commodity money.
Money is a unit of account.
It is a standard unit for quoting prices. It acts like a yardstick for measuring how much a good or service is worth. Money is a store of value. It retains its purchasing power over time so consumption can be delayed into the future. Money is a standard of deferred payment.