Money has other characteristics, as well, including limited supply, durability, divisibility, uniformity, portability, and acceptability. It can also be divided into M1 and M2.
Divisibility means that the money can be divided into smaller units.Uniformity means that the money of the same amount is completely similar.
Portability means that the money can be transferred easily even in small spaces. Acceptability means that the money is universally used as an object of trade within its specific region.
Limited supply means that there is a finite amount of that resource. Durability means that the object in question can survive wear and tear and still be acceptable.
Money that is considered M1 is money that can be immediately used as is in transactions and purchases. This includes checking accounts.
Money that is considered M2 is money that needs to first be converted into its worth in actual currency before being used. This is for savings deposits and mutual funds.