DeFi stands for decentralized finance. DeFi as a concept is to be able to offer almost all the financial services available with legacy and centralized institutions, typically banks, but on the blockchain. Whatever traditional services financial institutions provide can be expected to be offered through DeFi. In short, Defi is blockchain-based financial services that traditional financial services map into, creating new services or derivatives stemming from blockchain's unique features. Although we have had concepts like distributed computing and decentralized computing for decades, DeFi is in fact a new concept or an expansion of the application scope of blockchain as infrastructure.