Ethereum is a decentralised blockchain-based cryptocurrency with its own native currency, Ether (ETH), as well as a unique programming language known as Solidity. Ethereum, which was created in 2015 by a small group of crypto pioneers, has risen to become the world's second most popular cryptocurrency, trailing only Bitcoin. Ethereum was created by a team that included Joe Lubin and Vitalik Buterin, who is currently the Ethereum CEO and the world's youngest crypto millionaire at the age of 27.