Understanding Decentralized Finance: A Parallel Financial System

Decentralized finance (DeFi) has emerged as a rapidly growing parallel financial system, operating on blockchains where lending, trading, and earning interest happen automatically through smart contracts. This new system is based on open-source code that anyone can inspect, removing the need for intermediaries like banks and brokers.

The DeFi ecosystem has evolved significantly since its inception, with a notable increase in total value locked (TVL) from under $1 billion in early 2020 to peaks exceeding $180 billion in late 2021. The sector's growth demonstrates genuine demand for decentralized financial services, making it a substantial industry.

DeFi protocols use smart contracts on blockchains, primarily Ethereum, to automate financial services without intermediaries. Automated market makers like Uniswap and lending protocols such as Aave and Compound create money markets where suppliers deposit assets to earn interest and borrowers take loans by posting collateral. The critical mechanism in DeFi lending is over-collateralization, requiring borrowers to deposit more value than they borrow.

Stablecoins are the backbone of DeFi liquidity, providing a stable unit of account for transactions. However, the DeFi ecosystem carries significant risks, including smart contract vulnerabilities, impermanent loss for liquidity providers, and no deposit insurance or customer support if funds are lost. Users must understand these risks before participating in DeFi.