A computer has several essential components. It is a machine with a monitor, a keyboard, a mouse and a central processing unit [CPU] or systems unit. This is referred to as a computer.

The monitor is like the screen on TV which displays all visuals. It is also called the visual display unit. [VDU]

The keyboard is quite similar to an electronic typewriter with additional keys for new functions. It is the main device through which the operator enters the data.

It has four main types of keys; data keys used to enter letters, numbers and punctuation marks, shift keys to produce capital letters, control keys to help move the cursor function keys are used to issue common.

The mouse got its name when its long tail-like cord was connected it the CPU. It does the services of a pointer called the ‘ cursor’. The mouse is divided into two segments: The left and right.

The central processing unit or the systems unit is the heart of the computer. It does the major part of the instructions fed by the operator and stores the do cement for future references. Thus acting as a store house. These four parts are inter dependent and therefore we got the term computer system. A system is the mechanism of working according to a set order.