Decentralized finance, or DeFi, describes financial applications built on blockchain networks. Common examples include token exchanges and lending systems governed in part by smart contracts.
A smart contract is software, not a guarantee of a sound financial product. A wallet can interact with its rules, but each application has its own design and dependencies. The decentralization of an underlying blockchain does not automatically make every application equally decentralized.
Where risks arise
Contract bugs can expose funds to loss. Privileged administrator keys can also create a point of failure if compromised. Understanding who can change a contract is therefore part of understanding the application—not just a technical detail.
Smart contracts replace some intermediaries, not every risk
DeFi applications can execute published rules without a conventional operator handling each transaction, but contract bugs, governance powers, oracles, and liquidity conditions still create dependencies.
Exchanges and liquidity pools
Uniswap is one example of a DeFi protocol. Its automated market makers let people swap tokens against liquidity pools rather than matching every trade with a posted buy or sell order.
A pool is not a savings account. Its token balances and prices change as people trade, and supplying liquidity creates different exposures from simply holding those tokens.
Wallet approval is an active decision
Connecting a wallet usually reveals an address; signing or approving can authorize a transaction or token access. The exact request should be checked before confirmation.
Sources
Educational information, not investment advice.