Spoofing involves placing bids or offers with the intent to cancel them before execution to manipulate markets for profit. A recent criminal case in the US found Michael Coscia guilty of spoofing in futures markets using computer algorithms. The document discusses how spoofing works by placing large orders to influence prices and then canceling them to profit from the resulting price movement. It notes regulators are trying to crack down on deceptive trading practices like spoofing but that traders will always look for ways to gain an advantage, similar to athletes using performance-enhancing drugs.