Decentralized finance (commonly known as DeFi) is an experimental form of finance that does not rely on central financial intermediates such as brokerages, exchanges or banks to provide traditional financial instruments, but instead uses smart contracts in blockchains, the most popular being Ethereum 1.
DeFi platforms allow people to lend or borrow funds from third parties, speculate on the price movement of a range of assets using derivatives, trade cryptocurrencies, insure against risks, and earn interest on savings accounts.