Ethereum is the brainchild of computer programmer and co-founder Vitalik Buterin. Launched in 2015, it has since become the largest cryptocurrency in the world by market capitalization. Unlike Bitcoin, Ethereum is an entire ecosystem where developers can create decentralized software programs, from apps that let you borrow money without a bank to contracts that execute themselves without a middleman. And Ether (ETH) is the blockchain’s native cryptocurrency that powers it all. Here’s what to kno