The System Unit

Flash Memory

Flash memory is a type of electrically erasable programmable read-only memory(EEPROM) that can be erased and reprogrammed in blocks instead of one byte at a time. It also a section of memory cells can be erased in a single action.

Graphic cards

A graphic card is a card that interprets drawing instructions sent by the CPU, A computer must have a graphic card to play any game or do any animation without graphic card computer will usually feel lagging or hanging. It also can been called as video adapter

Sound cards

Sound card is an expansion board that enables a computer to manipulate and output sounds. Sound cards enable the computer to output sound through speakers connected to the board, to record sound input from a microphone connected to the computer, and manipulate sound stored on a disk.

Network interface card(NIC)

NIC Stands for "Network Interface Card." this is the card that physically makes the connection between the computer and the network cable. These cards typically use an Ethernet connection and are available in 10, 100, and 1000 Base-T configurations. A 100 Base-T card can transfer data at 100 Mbps.

Plug & Play

Plug and play also known as "PNP" it used to describe devices that work with a computer system as soon as they are connected. The user does not have to manually install drivers for the device or even tell the computer that a new device has been added. Instead the computer automatically recognizes the device, loads new drivers for the hardware if needed, and begins to work with the newly connected device.
Bus line

Bus line mean the wheels on the bus may go "round and round," data on a computer's bus goes up and down. Each bus inside a computer consists of set of wires that allow data to be passed back and forth. Most computers have several buses that transmit data to different parts of the machine. Each bus has a certain size, measured in bits (such as 32-bit or 64-bit), that determines how much data can travel across the bus at one time. Buses also have a certain speed, measured in megahertz, which determines how fast the data can travel.

HDMI

HDMI stands for "High-Definition Multimedia Interface." HDMI is a digital interface for transmitting audio and video data in a single cable. It is supported by most HDTVs and related components, such as DVD and Blu-ray players, cable boxes, and video game systems.

Cache memory

Cache memory is random access memory (RAM) that a computer microprocessor can access more quickly than it can access regular RAM. As the microprocessor processes data, it looks first in the cache memory and if it finds the data there (from a previous reading of data), it does not have to do the more time-consuming reading of data from larger memory.