"A thermal grease or paste is a compound that helps promote good conduction of heat between two surfaces," said Dwayne in his usual sleep-inducing voice. "These pastes are usually placed between the microprocessor and the heatsink. Some
fast computer processors are curved and they have air gaps between them, which weakens the cooling performance of the heatsinks. You use the grease to close the gaps by applying it on both the heatsink and the microprocessors."