Decentralized Finance, or DeFi, is an exciting new sector based on smart contracts and blockchains. DeFi applications on Ethereum have already locked up approximately $100 billion in funds, far exceeding its competitors. On Binance Smart Chain and Solana, DeFi apps are also available, although there are significantly fewer apps and much less liquidity than on Ethereum. DeFi has now disrupted the loan and trade industries the most. Automated smart contracts, such as Aave, allow anyone to lend or borrow bitcoin - loans are insured by overcollateralization. Decentralized exchanges (DEXs) are used for trading cryptocurrencies directly on the blockchain. Compared to centralized trading platforms, this provides more security and anonymity. Uniswap, SushiSwap, and Curve are three of the major DEXs on the Ethereum network.