Ethereum eth

Ethereum is a decentralized blockchain network and software platform for building applications that can run without a central company, bank, or other gatekeeper. It was proposed by Vitalik Buterin and launched in July 2015. Unlike a blockchain designed mainly for payments, Ethereum is designed to execute general-purpose programs called smart contracts.

Smart contracts are open-source programs stored on the blockchain. Once deployed, they can hold assets and enforce rules automatically whenever users submit valid transactions. This makes Ethereum a shared, global computing platform: anyone with an internet connection can use the same applications and verify their activity on the public ledger.

The network supports a broad ecosystem of decentralized applications, including decentralized finance (DeFi) exchanges and lending markets, stablecoins, games, social applications, and non-fungible tokens (NFTs). Developers can combine these applications and tokens because Ethereum uses common standards and shared settlement, creating a composable environment often called web3.

Ether (ETH) is Ethereum's native asset. It pays for computation and transaction fees, provides economic incentives for validators, and can also be transferred as digital money. Ethereum is maintained by thousands of independently operated nodes and is governed through open-source software development rather than by a single operator.

Ethereum addresses the limits of traditional financial and software systems that depend on intermediaries, closed databases, and permissioned access. It makes value programmable: money, ownership, and agreements can be represented by tokens and managed by code that runs on a shared network.

This enables decentralized applications (dApps) that can provide financial services such as exchanging tokens, lending, borrowing, and issuing stablecoins without requiring every participant to open an account with the same institution. The same programmable foundation supports NFTs for representing unique digital or physical items, as well as games, creator tools, governance systems, and other applications.

Ethereum does not eliminate all risks or intermediaries—users still face smart-contract bugs, scams, congestion, and irreversible transactions—but it gives developers a neutral platform where rules are transparent, globally accessible, and composable.

Users interact with Ethereum through a wallet. A transaction might send ETH, transfer a token, or call a function in a smart contract. The request is broadcast to the network and placed in a public transaction queue. A validator includes it in a block, and other nodes execute and verify the resulting state changes.

Smart contracts are programs deployed at blockchain addresses. They contain functions and stored data, and they execute deterministically when called. The Ethereum Virtual Machine (EVM) is the standardized runtime that executes this contract bytecode on Ethereum nodes, so every honest node can independently reach the same result.

Gas is the unit used to measure computational work. Each operation consumes a specified amount of gas, and the sender pays the gas fee in ETH. Gas limits computational abuse and infinite loops, while the market-based fee mechanism helps allocate scarce block space. Under EIP-1559, the base fee is burned and a priority fee generally goes to the validator; a transaction can consume gas even if contract execution ultimately fails.

Since The Merge in September 2022, Ethereum uses proof of stake rather than proof of work. Validators lock ETH as economic security, are selected to propose and attest to blocks, earn rewards for honest participation, and can be penalized for serious misbehavior. Proof of stake removed energy-intensive mining; the protocol advances in 12-second slots, although an offline validator can cause a slot to have no block.