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What Is Smart Contract?

Definition

A smart contract is a self-executing program stored on a blockchain that automatically enforces the rules of an agreement when predefined conditions are met.

A smart contract is code deployed on a blockchain that runs automatically when triggered. On Ethereum and EVM chains (Base, Polygon, Arbitrum), smart contracts are written in Solidity and compiled to EVM bytecode. On Solana, they're called "programs" and are written in Rust.

  • Token standards: ERC-20, ERC-721 (NFTs), SPL tokens
  • DeFi protocols: Uniswap, Raydium, Aave, Compound
  • DAOs: On-chain governance and treasury management
  • Bridges: Cross-chain asset transfers

Once deployed, a smart contract's code is immutable (unless it uses a proxy pattern). This immutability is both a feature (trustless execution) and a risk (bugs can't be patched).

For ERC-20 tokens, the smart contract defines the token's total supply, transfer rules, and any special features (like transaction taxes). CoinDevTools compiles and deploys these contracts for you — no Solidity knowledge required.

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Related Terms

ERC-20 Token
ERC-20 is the most widely used token standard on Ethereum and EVM-compatible chains, defining how fungible tokens are created and transferred.
Renounce Ownership
Renouncing ownership permanently removes the admin (owner) role from an ERC-20 smart contract, making it fully decentralized and immutable.
Liquidity Pool
A liquidity pool is a pair of tokens locked in a smart contract that enables decentralized trading on automated market makers (AMMs) like Raydium and Uniswap.