Ethereum is a decentralized blockchain platform that enables the creation of smart contracts and decentralized applications (DApps). It was proposed by Vitalik Buterin in late 2013 and development began in early 2014, with the network officially launching on July 30, 2015. Ethereum's native cryptocurrency is called Ether (ETH).

Smart contracts on Ethereum allow for the creation of self-executing contracts with the terms of the agreement directly written into code. This has led to a variety of applications, including decentralized finance (DeFi), non-fungible tokens (NFTs), and more.

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