$ETH Ethereum ($ETH) is the second-largest cryptocurrency by market capitalization after Bitcoin. It is an open-source platform based on blockchain technology that allows for the execution of smart contracts and decentralized applications (dApps). ETH is used to pay for transactions and fees on the Ethereum network. Additionally, it is the basis for many other cryptocurrencies and DeFi (Decentralized Finance) projects. Its value has seen significant fluctuations, but its potential and utility in the crypto ecosystem make it an important cryptocurrency to follow.