The CPU is the central processing unit that carries out instructions of computer programs. It has an arithmetic logic unit and control unit. Single core CPUs can run one operation at a time while dual core can run multiple. 32-bit CPUs can access up to 4GB of RAM while 64-bit can access much more. RAM is computer data storage that allows data to be accessed quickly in any random order. It loses data when powered off. A graphics card generates images for display and connects to the motherboard's expansion port. A heat sink cools electronic devices like those found in refrigerators and air conditioners. The motherboard holds crucial components like the CPU and RAM and provides power to connect other components.