What is DeFi (Decentralized Finance)?
Crypto Glossary Definition
Typically thought of in association with Ethereum, decentralized finance involves conventional financial tools built on a blockchain. This includes things like stablecoins, lending protocols, prediction markets, security tokens, derivatives and decentralized exchanges.
Why DeFi (Decentralized Finance) Matters
DeFi recreates familiar financial products — lending, borrowing, trading, earning interest — using smart contracts instead of banks or brokers. The tradeoff for cutting out the middleman is that users take on the risk of smart-contract bugs, and there's no deposit insurance or customer support if something goes wrong.
DeFi (Decentralized Finance) in Practice
Suppose someone wants to earn interest on stablecoins they're holding, but without going through a bank. They connect a wallet to a lending protocol, deposit their stablecoins into a smart contract, and immediately start earning interest paid by other users who are borrowing against collateral they've deposited on the same platform. No loan officer reviews an application, no bank sets the interest rate by internal policy — instead, an algorithm adjusts rates in real time based on the ratio of funds supplied to funds borrowed, and every transaction is visible on a public blockchain for anyone to audit. The same person might also use a decentralized exchange to swap one token for another, or a derivatives protocol to open a leveraged position, all without creating an account or getting approval from any company. This is DeFi: recreating the core functions of traditional finance — lending, borrowing, trading, earning yield — using open smart contracts instead of banks or brokerages as intermediaries. The convenience and permissionless access come with real tradeoffs, though: if the smart contract has a bug or gets exploited, there's no deposit insurance and no customer service line to call, and the user bears that risk entirely themselves in exchange for cutting out the middleman.
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