Ethereum is a decentralized blockchain. Also known as Ether.
The native Ethereum token — ETH — is currently the second most valuable cryptocurrency after BTC. Ethereum uses PoW consensus, but is in the process of moving to PoS and Ethereum 2.0 architecture.
Ethereum is the first blockchain that provides the ability to execute applications stored in it with Turing completeness — smart contracts — and is the most popular platform for DeFi services.