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DeFi (Decentralized Finance)

In short

Financial services on blockchain — no intermediaries.

DeFi (decentralized finance) rebuilds familiar financial services — lending, borrowing, trading, earning yield — using blockchain-based software instead of a bank, broker, or exchange as the middleman. A DeFi lending platform, for example, matches lenders and borrowers directly through a smart contract, which holds the collateral and enforces the terms automatically.

DeFi applications run on smart contracts — self-executing code deployed on a blockchain (most commonly Ethereum and similar networks) that holds funds and enforces rules without a company operating in the middle. Common categories include decentralized exchanges (swapping tokens directly between users), lending protocols (borrowing against posted crypto collateral), and yield-generating vaults. Because there is no institution to call, no deposit insurance, and no identity check, DeFi trades traditional-finance safeguards for open, permissionless access. Its added risks include smart-contract bugs or exploits that have led to large fund losses industry-wide, oracle failures (the price feeds contracts rely on to value collateral), and automated liquidations that can trigger without human intervention if collateral values fall sharply.

Related concepts

  • Liquidity Pool — A liquidity pool is a pot of two tokens that lets traders swap between them automatically. You provide the tokens and earn a share of trading fees. Risk: 'impermanent loss' if the prices of the two tokens diverge significantly.
  • Staking — In a Proof-of-Stake network, staking means locking up some of your coins as a deposit that lets you help validate transactions. Behave correctly and the network pays a reward, similar in spirit to earning interest — but the deposit itself isn't guaranteed: its value can fall, and in some networks a portion can be forfeited for misbehavior.
  • Gas Fees — Every action on a network like Ethereum — sending coins, swapping tokens, using a DeFi app — requires 'gas,' a fee paid to the network for the computing work of processing it. Gas fees rise and fall with demand: the same transaction might cost cents when the network is quiet and much more when it's congested, the way a toll road charges more at rush hour.