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Decentralized Finance or DeFi movement aims to establish an open financial system, as opposed to the existing, centralized ones. Bitcoin was the spark: the beginning of a chain reaction underpinning the rise of decentralized finance. Bitcoin, followed by other cryptocurrencies, made money and payments accessible to anybody who had an internet-enabled device. DeFi comprises a complete, yet decentralized financial system: savings, tradings, loans, insurance, everything, and insurance. The DeFi financial revolution is all about innovating practical, decentralized solutions to replace the centralized finance systems.