Decentralized Finance, DeFi for short, is the general name of the services, which allow us to perform any transactions in the field of traditional finance, in a decentralized way with smart contracts. A system where all kinds of financial services and transactions performed on blockchain are accessible to everyone from anywhere in the world has been made possible with smart contracts today. Thanks to these contracts, developers will no longer only be able to transfer cryptocurrencies but also benefit from many more useful, low cost and advanced functions in a fast way. One of these functions is what we call “Lending”, which describes the services of lending/borrowing and earning interest against collateral. Furthermore, stablecoins, mortgage contracts, loan and insurance transactions are all made easy and low cost with DeFi.