When you deposit money in a bank, you’re effectively making a loan, for which you get interest in return. Yield farming, also known as yield or liquidity harvesting, involves lending cryptocurrency. In return, you get interest and sometimes fees, but they’re less significant than the practice of supplementing interest with handouts of units of a new cryptocurrency. The real payoff comes if that coin appreciates rapidly. It’s as if banks were luring new depositors with the gift of a tulip -- during the Dutch tulip craze. Or a toaster, if toasters were the object of wild speculation and price swings.