$ETH is the native cryptocurrency of the Ethereum blockchain. More than just a digital currency, Ethereum is a decentralized, open-source platform that enables developers to build and run decentralized applications (dApps) and smart contracts. This programmable blockchain powers a vast ecosystem, from DeFi (Decentralized Finance) to NFTs (Non-Fungible Tokens). It's the second-largest cryptocurrency by market capitalization and operates on a Proof-of-Stake consensus mechanism, making it more energy-efficient.