DeFi in simple terms is a way to borrow, lend, and trade crypto with code instead of a bank. You keep control of your money throughout.<\/p>\n
Short for decentralized finance, DeFi covers financial products anyone with an internet connection can use, without a bank account or a company’s approval.<\/p>\n
Ethereum.org<\/a> describes it as a collective term for tools built on Ethereum that let you send, borrow, and trade money through code instead of a middleman.<\/p>\n Ethereum.org calls Bitcoin the first DeFi application in many ways; Ethereum added the smart contracts that make lending and exchanges possible.<\/p>\n Total value locked<\/strong>, the dollar value of crypto in DeFi contracts, stood at $87.4 billion as of August 29, 2026, per DeFiLlama<\/a>, a figure that moves with prices.<\/p>\n Lido alone holds $23.5 billion of that figure, with Aave V3 lending adding another $17.1 billion.<\/p>\n Lending on Aave<\/strong> skips the credit check, since neither side has to identify themselves.<\/p>\n Instead, the borrower locks up collateral that the protocol claims automatically if the loan goes unpaid; lend 100 Dai<\/strong> to Aave and you receive 100 aDai back.<\/p>\n That balance grows as interest accrues, and you can withdraw the matching Dai at any time.<\/p>\n Swapping works differently: Uniswap<\/strong> uses an automated market maker that matches trades against a liquidity pool instead of an order book.<\/p>\n Anyone can supply liquidity by depositing a pair of tokens, and larger trades move the price more, called price impact.<\/p>\n If you are weighing whether a centralized or decentralized exchange fits your first trade<\/a>, this mechanism is the core difference.<\/p>\n Crypto deposits carry no safety net: the FDIC lists crypto assets among products it does not insure, even when bought through an insured bank, so nothing like deposit insurance stands behind a protocol that loses your funds.<\/p>\n Borrowing against collateral carries its own trap: Aave marks a position eligible for liquidation once its health factor<\/strong> drops below 1.0, and a liquidator then takes your collateral plus a bonus.<\/p>\n Smart contracts can contain bugs, and a failing price oracle can produce incorrect valuations.<\/p>\n Flash loans are stranger still: you borrow and repay within a single transaction, or the whole thing reverts, and ethereum.org says they are not widely accessible to non-technical users.<\/p>\n DeFi also runs on self-custody, so losing the seed phrase that controls a self-custody wallet<\/a> means losing everything in it, with no support line to call.<\/p>\n Ethereum.org lays out the contrast between DeFi and traditional finance as paired statements, reproduced below. The same page says no centralized authority can block a payment or deny you access.<\/p>\n Pseudonymous does not mean anonymous. Every transaction sits on a public ledger, so you trade identity paperwork for a permanent, searchable record.<\/p>\nHow DeFi lending and swaps work<\/h2>\n
What goes wrong with DeFi<\/h2>\n
DeFi vs a bank in practice<\/h2>\n
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\n \nDeFi<\/th>\n Traditional finance<\/th>\n<\/tr>\n<\/thead>\n \n You hold your money.<\/td>\n Your money is held by companies.<\/td>\n<\/tr>\n \n Transfers of funds happen in minutes.<\/td>\n Payments can take days due to manual processes.<\/td>\n<\/tr>\n \n Transaction activity is pseudonymous.<\/td>\n Financial activity is tightly coupled with your identity.<\/td>\n<\/tr>\n \n DeFi is open to anyone.<\/td>\n You must apply to use financial services.<\/td>\n<\/tr>\n \n The markets are always open.<\/td>\n Markets close because employees need breaks.<\/td>\n<\/tr>\n \n It’s built on transparency, anyone can look at a product’s data.<\/td>\n Financial institutions are closed books.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n