In real life applications, there will be always deviation in topology on adjoining surfaces. Thermal interface materials (known as TIM) provide conformation to these surfaces. These surfaces are characterized by macroscopic or microscopic deviation. When the two surfaces are joined together, contacts occur at high points while the low points can form air–filled voids. TIMs allow the elimination of air pockets by conforming to the rough and uneven surfaces, and provide better thermal conductivity than air. It also reduces the thermal resistances which can provide an additional reduction in junction temperature.