1. An organizational structure governed by smart contracts and token-based voting rather than traditional hierarchical management. In a DAO, rules are encoded in transparent, immutable smart contracts on a blockchain, and governance decisions — including treasury allocation, protocol upgrades, and parameter changes — are made through on-chain proposals voted on by token holders. The DAO model represents a fundamental reimagining of corporate governance, replacing boards of directors and executive management with algorithmic rule enforcement and collective stakeholder decision-making.
2. The concept was first operationalized at scale by "The DAO" — a venture capital DAO launched on Ethereum in April 2016 that raised $150 million in ETH before being exploited via a reentrancy vulnerability in June 2016, resulting in the theft of approximately $60 million in ETH and the subsequent Ethereum hard fork that created Ethereum Classic. Modern DAOs have evolved significantly, with frameworks including Compound Governor, OpenZeppelin Governor, Gnosis Safe multisig, and Snapshot off-chain voting widely adopted.
See also: Governance Token · On-Chain Governance · The Vault — The DAO Hack 2016