System Unit

Expansion Card
Expansion card is an eletronic circuit board. It installed into expansion slots of a computer motherboard and adds functionally in to a desktop computer. Expansion card also known as add-on card, intenal card or interface adapter.For example, a user may add a new graphic card to his computer to give it more 3D graphics processing power.



Network Interface Card

A network interface card(NIC) is a computer circuit board or card that is installed into computer so that it can be connected to a network. NIC also is a device that allows computer to be joined together in a local area network(LAN). Networked computers communicate with each other by using a given protocol or agreed-upon language for transmitting data packets between the different machines, known as nodes. The network interface card acts as the liaison for the machine to both send and receive data on the LAN.


Cache Memory

Cache memory is random access memory (RAM) that a computer microprosessor can access more quickly than regular RAM.Cache memory is extremely fast memory that is built into a computer’s central processing unit (CPU), or located next to it on a separate chip.The CPU uses cache memory to store instructions that are repeatedly required to run programs, improving overall system speed. The advantage of cache memory is the CPU does not have to use the motherboard’s system bus for data transfer.


Plug&Play

In computing, plug and play is a term used to describe the characteristic of a computer bus, or device specification, which facilitates the discovery of a hardware component in a system.Plug and Play (PnP) is a capability developed by Microsoft for operating systems that gives users the ability to plug a device into a computer and let the computer recognize that the device is there.


Sockets
A socket is a single connection between two network applications. These two applications run on different computers, but sockets can be used for interprocess communication on a single computer. Computer sockets are the built-in interfaces on motherboards that can accept various hardware components. The compatible devices will communicate with the system to provide functionality when they are plugged into computer sockets. For example,dial-up modems, graphics cards and sound cards.


Chips(computer-chips)

A computer chip is a small electronic circuit, also known as an integrated circuit. It is one of the basic components of most kinds of electronic devices, especially computers.Computer chips are small and made by semiconductors that is usually composed of silicon, on which several tiny components including transistors are embedded and used to transmit electronic data signals.


Slots
In computing, a slots or expansion slots are the opening in the computer where you can insert a printed circuit board. It's allow us to expand the capabilities of a computer, for instance, more memory, graphics capabilities. The boards that insert into the expansion slots are called expansion boards, expansion cards, add-ins, or add-ons.



Buslines
In computing, a bus is a subsystem that transfers data between computer components inside a computer or between computers.The bus lines are the communicating electronic lines that connect different parts of the CPU to various other parts. It also link the CPU to different parts on the system board of computer.



Serial Port

In computing, a serial port is a serial communication physical interface through which information transfers in or out one bit at time.Most serial ports on personal computers conform to the RS-232C or RS-422 standards. A serial port is a general-purpose interface that can be used for almost any type of device, including modems, mice, and printers.



Parallel Port

Parallel port is a simple and inexpensive tool for building computer controlled devices and projects. It is also known as a printer port or Centronics port. A parallel interface for connecting an external device such as a printer. Most personal computers have both a parallel port and at least one serial port.

Universal Serial Bus(USB)

An external bus standard that supports data transfer. It also a way of setting up communication between a computer and peripheral devices. USB is intended to replace many varieties of serial and parallel ports. USB also supports Plug-and-Play installation and hot plugging

Firewire port

FireWire is some type of Serial Port which uses the serial bus interface standard for high speed data transfer. The FireWire port has been in common use since 1995, it's began to include the port on a number of digital camcorders. Today, the FireWire port is used on a number of other devices.