Decentralised Finance, or "DeFi," is an open, global alternative to the constrained, regulated, and centuries-old traditional financial system with which most people are familiar today. Anyone with a smartphone and internet connectivity may use DeFi to invest, borrow, lend, and trade their money on their own terms. Rather than employing banks as intermediaries, DeFi puts a person at the heart of a peer-to-peer financial system built on open-source blockchains like Ethereum (ETH). It's a system that allows people to invest, borrow money, send money internationally, and do pretty much anything else (connected to digital money) without ever leaving their homes.