$ETH Ethereum (ETH) is a decentralized, open-source blockchain platform that supports smart contracts. It is the second most popular cryptocurrency after Bitcoin. Unlike Bitcoin, Ethereum is not just a digital currency—it also allows developers to build decentralized applications (dApps) on its network. Its native token, Ether (ETH), is used to pay for transactions and computational services. With the Ethereum 2.0 upgrade, the network transitioned to a Proof of Stake (PoS) system, which improved energy efficiency and scalability. Today, Ethereum is considered the backbone of Web3, powering innovations like DeFi (Decentralized Finance), NFTs, and more.