decentralized finance (DeFi)

DeFi, short for decentralized finance, is a way of rebuilding financial services — lending, borrowing, trading, saving, insurance — as open software running on a blockchain instead of inside banks and brokerages. The core shift is who holds the rules. In traditional finance a company keeps a private ledger and decides who may take part; in DeFi the rules live in smart contracts that anyone can read, anyone can use, and no one can quietly change. The bank is replaced by code that everyone can inspect.

Because these services are just contracts on a public chain, they run automatically and around the clock, and you interact with them straight from your own wallet — you keep custody of your funds rather than depositing them with an institution. They are also composable, meaning one app can plug into another like interlocking bricks: a token you earn from lending can be deposited into a trading pool, which can be used as collateral elsewhere, all in a single chain of transactions. People call this property "money legos."

DeFi matters because it makes a working financial system available to anyone with an internet connection and a wallet, with no account approval, no business hours, and no borders. A farmer, a student, and a hedge fund touch the exact same contracts on the exact same terms. Whether someone is lending, swapping currencies, or earning yield, the logic is open for all to read and the system never closes.