If Bitcoin gave us digital money and Ethereum gave us programmable money, then liquidity pools gave us usable money. But what are liquidity pools? Think of them as the invisible plumbing that makes decentralized finance (DeFi) work. They enable token swaps, lending, yield farming, and the countless apps that now make up on-chain finance. Without them, there would be no DeFi markets, no instant token trades, and no decentralized exchanges (DEXs) as we know them. But for all their importance, l...