"Heat sink (also commonly spelled heatsink) is a passive heat exchanger that transfers the heat generated by an electronic or a mechanical device.
In simple words the function of heat sink is to cool down the IC for smother operation.
Passive heat sinks are 100% reliable, as they have no mechanical components.
Passive heat sinks are made of an aluminum-finned radiator that dissipates heat through convection.
This Heat Sink Suitable for Step stick, Raspberry Pi, and electronics components, processors, microcontrollers, etc."