Blockchain Technology | Ethereum — Smart Contracts Turn Programmable Money into Reality

Ethereum introduced the concept of a blockchain that could execute arbitrary code through smart contracts. Proposed by Vitalik Buterin in late 2013 and launched on 30 July 2015, the network transformed blockchain from a ledger for cryptocurrency into a platform for decentralized applications. The innovation rested on the Ethereum Virtual Machine (EVM), a Turing-complete runtime that could process transactions containing executable bytecode. Developers could write contracts in Solidity, deploy them to the network, and trust that they would execute exactly as written without intermediaries. By 2026, Ethereum has become the foundation for decentralized finance (DeFi), non-fungible tokens (NFTs), and thousands of applications that reimagine how value and ownership can be transferred on the internet. The network's transition to proof-of-stake in 2022 reduced energy consumption by over 99%, addressing one of the earliest criticisms of blockchain technology.