When money is deposited in the bank fo later use, it is a store of value. When describing money, medium of exchange, store of value and unit of account are all terms that describe the use of money. Money is used as a medium of exchange for a good or service. Money is a unit of account because it varies in the unit it is worth. Money is also a store of value because it is something that can be put away and kept for future use so it is being stored at the value it holds.
