Centralised crypto-coins are a code-based asset designed to be used as a medium of exchange. Additional coins are created via mining. Everyone is able to do this by using their a computer. Mining requires a large amount of hours and electrical power, however. A powerful machine is also vital, to do this profitably. On the other hand, Ripple is a centralised asset, which cannot be mined. A fixed amount of coins were made by the company and this number will never be added to.