The CPU in a computer generates an enormous amount of heat. This heat is dissipated by using a heat sink. For the heat to be transferred between the CPU and the heat sink heat conducting pastes known as
thermal paste or thermal grease are used.
Thermal Pads can also be used for CPU cooling. Thermal Pads have a compound already applied to them. The thermal pads are fitted between the CPU and the Heat sink. When the CPU is started and heat is produced, the compounds in the thermal pads undergo a phase change. This ensures proper heat transfer.