<P>A keyboard is the main input device that lets you input data and execute commands given to the computer.It has some additional keys categorised into four main areas:<p><BR><BR>

1.Typing keypad:It includes a.character symbols(A-z).<BR>

2.Numeric keypad:It includes number keys from 0 to 9.<BR>

3.Function keys:There are 12 keys,which perform special tasks.They are from F1 to F12.<BR>

4.Editing keypad:It comprises of insert,delete,backspace,page up,page down keys,etc.<BR><BR><BR><BR>

<LI><H2> <A Name ="Scanning system">Scanning system</A> </H2>

<P>Scanning Systems are the eyes of a computer that read words,pictures,or numbers directly from the page and convert them into a form which the computer can understand,and display them directly on the monitor,Scanner allows you to save a printed picture,and text as a file on a PC.<P><BR><BR><BR>

<LI><H2><A Name="OCR">OCR</A></H2>

<P>Optical Character Recognition:It is used ti read characters from a printed paper into the computer.The shape of the character is recognised by OCR with the help of a light source in conjunction with the photoelectric cells.When a page of text is scanned .It is converted into computer readable from and reproduced just as though it has been typed.The software then places the text into a dovument tht can be edited using the word processor or text editor.<P><BR><BR>

<LI><H2><A Name ="OMR"</A></H2>

<P>Optical Mark Reader:It is an excellent device for checking the documents and multiple choice type questions.