What is a CPU heatsink?

• A. A device that provides power to the CPU.
• B. A protective plastic cover for the motherboard.
• C. Metal thermal mass that draws heat away from the CPU to be removed by airflow.
• D. A memory module.

Answer: (C)

A CPU heatsink is a metal piece that cools the processor by absorbing its heat and transferring it to the surrounding air. It’s typically made of aluminum or copper and sits directly on the CPU with a thermal interface material to improve heat transfer. The heatsink has fins to increase surface area, so when air from a fan or case moves through the fins, the heat is carried away efficiently, keeping the CPU at safe temperatures. It isn’t a power source, a protective cover for the motherboard, or a memory module—its sole job is to remove heat from the CPU through efficient conduction and convection.