Thermal interface material

The term thermal interface material (shortened to T.I.M.) describes any material that is inserted between two parts in order to enhance the thermal coupling between these two components. A large portion of those application are related to the heat dissipation and the T.I.M. is inserted between the heat producing device (e.g. the heat source) and the heat dissipation device (e.g. the heat sink).

There are several kind of T.I.M. with different target applications

...
Wikipedia