Normal crypto-coins are a digital resource designed to work as a medium of exchange. crypto-coins are added through mining. Everyone is able to do this if they've access to a device. Mining requires a large amount of hours and electricity, however. A high-powered computer is also needed, to do this profitably. Conversely, Ripple is a centralised resource, which is unmineable. A fixed number of tokens were made by the company and this amount will never be added to.