$ETH Ethereum (ETH) is an open blockchain platform that supports smart contracts and dApps (decentralized applications). Launched in 2015 by Vitalik Buterin and collaborators, Ethereum allows for the development and deployment of applications without the need for third-party intervention. Ethereum uses a currency called Ether (ETH), which is used to pay for transactions and network usage fees. Ethereum has become an important platform for new blockchain technologies such as DeFi, NFT, and DAO. Ethereum is also transitioning to a Proof of Stake (PoS) mechanism to save energy and enhance security.