Ethereum is a decentralized, open-source computing platform that enables the creation of smart contracts and decentralized applications (dApps). More poetically described as "the world computer," it was first conceptualized in a 2013 white paper by Vitalik Buterin. His paper detailed the vision for a blockchain that would transcend the financial-transaction limitations of Bitcoin, allowing developers to build and deploy their own unstoppable applications.
The core innovation that Ethereum brought to the blockchain space was the concept of smart contracts—self-executing contracts with the terms of the agreement written directly into code. This functionality unlocked the potential for dApps, which run on a peer-to-peer network rather than a central server, fostering a new digital era of finance (DeFi), gaming, and digital collectibles (NFTs).
The lifeblood of the Ethereum network is its native currency, Ether (ETH), which is used to pay for computational services in a unit known as "gas." Gas is the fuel for executing smart contracts and powering dApp operations. A significant evolution in Ethereum's economic model came with the "London" upgrade and the implementation of EIP-1559 in August 2021. This introduced a mechanism that burns a portion of the gas fees with each transaction, adding a deflationary pressure to ETH's supply.
On September 15, 2022, Ethereum underwent its most ambitious upgrade to date, "The Merge." This historic event transitioned the network's consensus mechanism from the energy-intensive Proof-of-Work (PoW) to the much more efficient Proof-of-Stake (PoS). According to the Ethereum Foundation, this shift reduced the network's energy consumption by an estimated 99.95%. The move also led to the creation of EthereumPoW (ETHW), a fork of the mainnet that opted to retain the original Proof-of-Work consensus for a segment of the community.