DeFi (Decentralised Finance) refers to an ecosystem of financial applications built on blockchains — primarily Ethereum — that replicate and reimagine traditional financial services (lending, borrowing, trading, insurance, derivatives) without banks, brokers, or any centralised intermediary. Instead of trusting institutions, DeFi protocols are governed by transparent, auditable smart contracts that execute automatically when conditions are met.
The core DeFi product categories: Decentralised Exchanges (DEXs) — Uniswap, Curve, dYdX allow permissionless token trading via automated market makers (AMMs); Lending/Borrowing — Aave, Compound allow users to earn interest on deposits or borrow against crypto collateral; Stablecoins — MakerDAO’s DAI is a crypto-collateralised stablecoin governed by smart contracts; Yield Aggregators — Yearn Finance automatically moves funds between protocols for optimal yields; and Derivatives — Synthetix, GMX enable synthetic exposure to real-world assets and perpetual futures.
DeFi advantages: permissionless access (no bank account needed), transparency (all transactions on-chain), composability (“money legos” — protocols can be combined). Risks: smart contract exploits, liquidation risk, impermanent loss, regulatory uncertainty, and high gas fees during congestion. Total Value Locked (TVL) — the total assets deposited in DeFi protocols — peaked above $180 billion in late 2021.
Example: A user deposits $10,000 USDC into Aave (a DeFi lending protocol). They earn 4.5% APY automatically, paid continuously in real-time by borrowers. No bank account, no ID, no minimum balance, no business hours — the smart contract handles everything.
Learn more: DeFiLlama — DeFi TVL Rankings & Analytics
