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A set of smart contracts deployed on-chain that together provide a specific decentralized financial service such as lending, trading, or liquid staking. Each DeFi protocol defines its own rules for deposits, withdrawals, fees, and governance through immutable or upgradeable program logic. Examples on Solana include Marinade (liquid staking), Raydium (AMM), Drift (perpetuals), and Kamino (automated vaults). Users interact with protocols by sending transactions to their program addresses.