Bitcoin
and Ether are two of the better-known cryptocurrencies or coins (note that the coin on the Ethereum network is called Ether, though is often misnamed in the media as ‘Ethereum’). These are assets or items of value that exist digitally, not physically, and are created by software. They have no issuer as such. No person, company, or entity backs these, and there are no terms of service or guarantees associated with them. Like physical gold, cryptocurrencies simply exist, and are created or destroyed according to the rules articulated in the code that creates and governs them.