DeFi Basics
Explore decentralized finance — how DEXs, lending protocols, yield farming, and liquidity pools work, and what TVL really means.
What Is DeFi?
DeFi (Decentralized Finance) is an ecosystem of financial applications built on blockchains that offer services like trading, lending, borrowing, and earning interest — without banks, brokers, or other traditional intermediaries. Instead of a bank deciding whether to approve your loan, a smart contract automatically processes it based on code. DeFi is open 24/7, available to anyone with an internet connection and a crypto wallet, and fully transparent since all transactions are on-chain.
Decentralized Exchanges (DEXs)
A DEX lets you swap one cryptocurrency for another directly from your wallet, without creating an account or trusting an exchange with your funds. Uniswap (on Ethereum) and Jupiter (on Solana) are the most popular. Instead of matching buyers and sellers like a stock exchange, most DEXs use "liquidity pools" — shared pots of tokens that enable instant swaps using a mathematical formula to determine prices.
Lending and Borrowing
DeFi lending platforms like Aave and Compound let you deposit crypto to earn interest (like a savings account) or borrow crypto by providing collateral. The interest rates adjust automatically based on supply and demand. Because there is no credit check, all DeFi loans are over-collateralized — you must deposit more value than you borrow.
Start Small
DeFi is powerful but complex. Start with small amounts to learn how swapping, depositing, and wallet approvals work before committing significant funds. Gas fees on Ethereum can be high, so consider starting on lower-cost chains like Arbitrum, Base, or Solana.
Key Takeaways
- DeFi replaces banks and brokers with smart contracts that execute automatically
- DEXs let you trade directly from your wallet using liquidity pools
- DeFi lending requires over-collateralization — no credit checks, but you must deposit more than you borrow
- Start with small amounts on lower-fee networks to learn safely
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