Main memory or memory Motherboard Adapters Hard Disk Drive CPU Fan and Heat sink CPU S-ATA data cable Optical Drive System Unit Expansion Bus 1. It is the main circuit board of a computer. It contains all the circuits and components that run the computer. 2. It is the computer's working storage space that holds data, instructions for processing and processed data (information) waiting to be sent to secondary storage. 3. It enables the computer to use a peripheral device for which it does not have the necessary connections or circuit boards. They are often used to permit upgrading to a new different hardware. 4. It is used as permanent storage for data. 5. It helps in reducing the heat from the processor so it will not shutdown automatically 6. It performs all of the instructions and calculations that are needed and manages the flow of information through a computer. 7. It is used to connect S-ATA type Hard Disk Drive to motherboard. 8. It allows a user to retrieve, edit and delete the content from optical disks such as CDs, DVDs and Blu-ray disks 9. Serve as a main part of a microcomputer 10. It connects the parts of the CPU to each other and links the CPU with other important hardware.