Ethereum (ETH) is a decentralized, open-source blockchain that enables smart contracts and decentralized applications (DApps). Launched in 2015 by Vitalik Buterin and others, Ethereum introduced a revolutionary way to program blockchain systems using smart contracts—self-executing pieces of code that run on the blockchain. Unlike Bitcoin, which is mainly used for peer-to-peer transactions, Ethereum’s primary goal is to support the development of decentralized services. After transitioning from Proof of Work (PoW) to Proof of Stake (PoS) in 2022 through an event known as The Merge, Ethereum became more energy efficient. It is the backbone of many major ecosystems including DeFi (Decentralized Finance) platforms, NFTs (Non-Fungible Tokens), and Layer-2 solutions. Ethereum's native currency, ETH, is used to pay for transactions and computational services on the network, often referred to as "gas." $ETH #ETH