RAM
It can be defined as Random access memory is a form of computer data storage it allows data to be accessed in any order and its much faster to read from and write to than the other kinds of storage in a computer, its small, both in physical size and its stored in microchips.

CACHE MEMORY
Its a random access memory (RAM) that a computer microprocessor can access more quickly than it can access regular ram, cache small amount of high speed memory usually with a memory cycle time comparable to the time required by the CPU


ROM
read only memory it is a class of storage medium used in a computer and other electronic device, data stored in rom cannot be modified, or can be modified only slowly or with difficulty.



FLASH MEMORY
Is a non-volatile computer storage chip that can be electrically erased and reprogrammed it is primarily used in memory cards USB flash





GRAPHIC CARD
Is an expansion card whose function is to generate output images to a display. most video offer added functions such as accelerated rendering of 3D scenes and 2D graphic.

SOUND CARD
is an internal computer expansion card that facilitates the input and output of audio signal to and from a computer under control of computer program



NETWORK INTERFACE CARD
Is a device that allows computer to be joined together in a LAN, or local area network, it is commonly refered  to as a network adapter and is an expansion card that enables a computer to connect to a network such as a home network or the internet using ethernet cable with a RJ-45 connector


PLUG AND PLAY
Used to describe the characteristics of a computer bus, or device specification, which facilitates the discovery of a hardware component in a system, without the need for physical configuration or use intervention in resolving resource conflicts.

SERIAL PORT
is a serial common physical interface through which info transfer in or on bit at a time


PARALLEL PORT
Is a type of interface found on computers for connecting port, is a parallel communication physicaly interface. and its known as a printer port or centronic port

UNIVERSAL SERIAL BUS PORT
is a specification to establish communication between devices and a host controller usually a personal computer it includes USB2 port as well as the express bus port