Standard crypto-coins are a code-based holding designed to be used as a medium of exchange. Additional units can be created through mining. Any person may do this by using their a device. Mining requires a large amount of time and electricity, however. A fast machine is also vital, to mine successfully. However, Ripple is a centralised resource, which can't be mined. A limited number of units were created by the firm and this number will not be added to.