What is DeFi?
DeFi (decentralized finance) is a set of financial services — trading, lending, savings — built as smart contracts on public blockchains, so users interact with protocols directly instead of through banks or brokers.
Also known as: decentralized finance · on-chain finance · DeFi protocols
In plain terms
DeFi recreates financial services with code instead of companies: you can swap tokens, lend assets to earn interest, or borrow against collateral, all by interacting with contracts on a blockchain.
Nobody runs your account. There is no password reset, no customer support line, and no institution guaranteeing results — the contracts and your keys are the system.
How it works
Protocols deploy smart contracts that hold pooled assets and enforce rules automatically: how trades execute at a liquidity pool, how loans are collateralized and liquidated, how interest accrues.
Users connect a wallet and interact with the contracts directly, paying gas fees per transaction. Positions can usually be opened or closed at any time, without account approval.
Risk lives in the contracts and their inputs: code bugs, oracle failures, unstable collateral and governance attacks are the main ways users lose funds.
Example
Hypothetical: a user deposits $10,000 of a stablecoin into a lending protocol's pool, earning a variable rate paid by borrowers. A borrower posts collateral and borrows from that pool; if their collateral value drops below the required threshold, the protocol liquidates it to protect lenders.
Why it matters for founders and investors
DeFi is where most on-chain liquidity for tokens lives, which affects everything from stablecoin utility to how tokenized assets can be traded.
For founders, DeFi rails can replace parts of traditional treasury and settlement operations, but they introduce smart-contract and market risks that need management.
Common misconceptions
Decentralized does not mean risk-free. Protocol exploits, bad collateral and governance failures have caused billions in losses; audits reduce but do not remove the risk.
Yields shown in DeFi are variable and can collapse when demand changes; they are not fixed interest from a bank.
Frequently asked questions
Is DeFi regulated?
Regulation is developing and varies by jurisdiction. Some DeFi activities clearly fall under existing securities or money transmission rules; others remain in gray areas. Users and builders need local legal analysis.
What is a stablecoin's role in DeFi?
Stablecoins are the main unit of account and collateral in DeFi — most lending, trading pairs and treasury operations use them because they avoid crypto price volatility.