DeFi (Decentralized Finance) is like the wild, wild west of finance—but in a good way. It’s an ecosystem where you can lend, borrow, and trade without banks or brokers. Platforms like Uniswap and Compound use liquidity pools (think of them as big pools of digital money) to make this possible. Yield farming is when you lend your crypto to earn rewards, and liquidity mining is when you provide liquidity and get paid in tokens for it. It’s like earning interest but way cooler.