Ethereum is a blockchain, with a native cryptocurrency Ether (ETH). It allows users to build diverse decentralized applications on top of it.

Vitalik Buterin created the Ethereum blockchain and Ether in 2015. ETH is currently the second-largest crypto by market capitalization.

The Ethereum blockchain differs from the Bitcoin blockchain. It allows users to build decentralized applications (DApps) that run on their own, like a decentralized computing platform.