Normal crypto is a digital resource designed to be used as an apparatus of exchange. Additional units can be added by mining. Any person is able to do this if they've access to a device. Mining uses a lot of time and electrical energy, however. A high-powered computer is also needed, to mine profitably. On the other hand, XRP is a centralised asset, which is unmineable. A fixed amount of units were created by the company and this number will not be added to.