System Clock

* Its a electronic device that synchronizes the the components inside a computer. All the pulses are the same in the system clock. It also has a steady signal.

Scanner

* A scanner is a electronic system that is used for copying or color images or black and white for proofing or printing.

Read - only memory (ROM)

* Its a type of computer memory in which programs and any other type of stuff are permanent stored. Unlike a ram you can not change this data. The ROM is usually on electronic chips.

Random access memory (RAM)

* RAM is a type of computer data storage. This memory is available to you and you can create it, a program can be running, and something can be loading. It allows stored data to be seen in any sequence. It holds all the information.

Pointer

* A pointer is a identifier that gives the location in which data is stored. It basically shows you on the computer screen where you are clicking or where the data is literally stored.

Plotter

* A plotter is used for computer printing. Computer plotters are used in applications in computer design. Now a days plotters have been replaced so people don't really use them. A plotter works by moving a pen across a piece of paper.

Out -put devices

* An output device is any computer hardware that is processing data and is carried out by a information processing system to the outside. For example speakers and printers are output devices.