System Unit

RAM
Random-access memory or RAM is the computer ships that temporarily store dynamic data to enhance computer performance. Random access memory is volatile. Once the power is cut, it would lose its contents when the computer shuts down properly. It can be used in pringters and other devices.

Cache

The purpose of cache is to store recently-use information in a place there it pages, images, and URLs of recently visted Web sites on your hard drive. It automatically save the data while you are visiting the pages, flashs, and images on internet so you don't have to download them all over again.

ROM
Read-Only Memory or ROM is memory containing hard wired instructions that the computer uses when it boots up before the system software loads.

Flash Memory

Flash Memory is commen memory device in the world. It is a non-volatile computer storeage chip which can be electrically erased and reprogrammed. It is used in several products such as memory cards, USB flash drives,thumb-drives, MP3 players, digital camera memory cards, SanDisk and so on.

Graphic Card

Graphic Card is also known as video card, is a piece of hardware which rendering the image on the computer's monitor or display screen. While the end-user is using the computer to watch videos or play games, graphic card is responsible for the quality of the views.

Sound Card

Network

Interface CArd

Plug and Play

Universal Serial 3us port(USB)

Serial Port

Paralled Port

Firewire Port

Ethernet Port

High Definition Multimedia Interface Port(HDMI)