Definition of Computer:
“Computer is an electronic machine which accepts
data and instruction process them and finally gives
output result". The output result is called information.
Computer is also called “data processing machine”.
THE FULL FORM OF COMPUTER IS:
C = Calculating (u0fgf ug]{) Commonly
O = Operating (rnfpg])
M = Machine (oGq)
P = Processing (k|;f]wg ug]{)
U = Unit (PsfO{)
T = Technology (k|ljlw)
E = Education (lzIff)
R = Research (vf]hL ug'{)
CHARACTERISTICS OF COMPUTER:
(sDKo'6/sf ljz]iftfx?):
Increasing the popularity of computers has provided
that it is very useful tools. The power and usefulness of
this popular tool are mainly due the following
characteristics:
Automatic (:jrfng):
Speed (sfo{ j]u):
 Accuracy (z'¢tf):
Diligent (nugzLn):
Versatile (kl/jt{gzLntf):
Storage (8f6f e08f/):
 Power and Remembering.
Note: GIGO = Garbage In Garbage Out.
Advantages (merits) of Computer:
 Computer can work very fast.
 Computer can give accurate results.
 It can stores large amount of data for future use.
 It can work automatically.
 The best advantage of computers is that we can use the
Internet by computer.
Computer can be use in many fields and applications etc.
Disadvantages (demerits) of Computers:
 Incapability to take decisions on their own, like human
beings.
 It is expensive machine so it is not affordable by
everyone.
 People can addict to them, so next they don’t think normal.
 It cannot maintenance itself so it needs user.
 It needs dust free room and fixed temperature etc.
APPLICATION AREAS OF COMPUTER:
Computer can be used as different fields: They are
1)
2)
3)
4)
5)
6)
7)
8)
9)
Education
Banking
Office
Hotel
Aviation (Aero plane, Jet plane, Rocket etc.)
Music and Entertainment
The military
Engineering
Medicine and Health care etc.
Icon:- The graphical pictures or symbols are called icon.
Taskbar:- It is used to show the running programs.
System Tray Area:- It gives the information about
computer system.
Wallpaper (Desktop):- The background area is called
wallpaper.
Folder (Directory):-It is an electronic bag which contains
files and sub-folders.
New folder = Ctrl+ Shift+ N
Rename= F2
Function Key = F1 – F12
Permanently Delete = Shift+ Delete
Recycle Bin (Trash Can):- It is just like a dust bin which
contains deleted files and folders.
Utility Button:- (Control Buttons) :-Minimize,
Maximize and Close button are called Utility button.
VDU (Visual Display Unit) is the another name of
Monitor.
DPM (Data Processing Machine) is the another name of
Computer.
Notepad:- It is a text editor program which is used for
simple type of typing, formatting and printing.
It is mainly used to write HTML Program. It's
extension filename is .txt .
WordPad:- It is a small word processing program which
is used for typing, printing, formatting the documents.
It's extension filename is .rtf (Rich Text Format)
MS-Paint:- It is used for drawing purpose. It's extension
filename is .bmp (Bitmap Image).
Extension filename:- The filename which comes after
dot/period (.) is called extension filename. It is used to
categorize the program
file.
E.g:MCC.bmp
Primary filename
Extension filename
WordPad:
Word pad is small word processing software.
The application file name of word pad is wordPad.exe
The extension file name of word pad is .rtf ( Rich Text
Foramt)
Some other examples of other application software:
1) Ms-Word
.doc or .docx
2) Ms-Excel
.xls or xlsx
3) Ms-Power Point
.ppt or .pptx
4) Ms-Access
.mdb or .accdb
5) Ms-Paint
.bmp
6) Notepad
.txt
7) Word Pad
.rtf etc