Ethereum is the second largest cryptocurrency after Bitcoin and is a leading platform for smart contracts and decentralized applications (DApps). Launched in 2015 by Vitalik Buterin, it is distinguished by its ability to execute code automatically without intermediaries, revolutionizing the world of digital finance. Ethereum now relies on a Proof of Stake (PoS) mechanism after transitioning from Proof of Work (PoW) in the 'The Merge' update, significantly reducing energy consumption. It is used in decentralized finance (DeFi), non-fungible tokens (NFTs), and private blockchains. The future of Ethereum is promising, but it faces challenges related to speed and fees.