KEY BOARD -
It is a standed input device , most commonly available in Computer .key board has 104 keys . some special keys are include in the “ Enhanced key board” .the are diffirent of th key board .

Alphabet Key-
That include latter & number .
Punctuation Key-
They are colon(:),the semicolon(;), the question mark(?) ,the quote(‘) and douotes(“) .
Function Key-
They are special keys ,that are use to perform specific function .They are labeiled as F1 , F2 & F3 and so on till F12 .The F1 key is the most software is provide help on the software.
 

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MOUSE-
Mouse is the hand hale pointing device .which is used mainly GUI(Graphical User Interface) to point and select patients display on the monitor . Left baton is the most frequently used for selection person . Scroll mouse comes with while between the left and right bottom and optical mouse is pointing datex moment by sending changes in reflected light when use mouse on a flat surface .you will see an arrow moving on the skrin . That is know as the mouse pointer .

MOMITOR –
Monitor is called us visual display unit (vdu) .This is the standard output devices. The information appear in the screen as when we entry it throw input devices, the output are seeing in the screen in the screen is called as soft copy .
Other that CRT we have LCD and plasma display to displays text or graphics. It has separate power button to turn it ON or OFF. Normally 14”,15”,17” and 21” are salable in market .