2.  Computer is an electronic machine
that process data into information.
 Computer is a digital machine
which works at digits (Binary
Language i.e. 1,2,3,4,5,6,7,8,9,0).
 It is electronic automatic machine,
first we input data and CPU
(Central Processing Unit) processes
that data and gives output which is
useful for people.
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3.  A computer is an electronic device,
a flexible machine that can
manipulate data. The term
computer is used to describe a
device made up of a combination
of electronic and
electromechanical components. By
itself, a computer is referred to as
hardware. A computer doesn’t
come to life until it is connected to
other parts of a system. A
computer system is a combination
of five elements.
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4. There are two internal parts of Computer.
1. Software
2. Hardware
These are two inner parts of computer, without
these our computer can't be operated.
These are most important parts of our
computer.
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5.  An organized sets of instructions for
controlling the computer’s hardware is
called Software.
 The programs of computer are also called
Software.
 Software is the term used to describe the
instruction that tell the hardware how to
perform a task. Without software
(instructions) the hardware doesn’t know
what to do. In other words, without
software , hardware is useless.
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6.  The types of software that you use
determines what you can do with your
computer.
 System can be divided into two general types:
1. System Software
2. Application Software System
Software
Software
Application
Software
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7.  Those programs which exists for
the computer’s use, to help it,
manage its own tasks and devices System
is called System Software. Software
 A set of instruction that is only
used for maintaining and handling Operating
Utilities
the hardware of computer is called System
System Software.
 System Software underlies Windows Drivers
application software, it startup the
computer and function as the Anti viruses
principle coordinator of all
components and application
software programs. Without system etc
software loaded into the RAM of
your computer, your hardware and
application software are useless.
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8.  The programs which exists for the use of
only user, to get proper output from
computer and enable the computer to
perform the task which user wants to take
is called Application Software.
 A set of instructions that are only used for
user’s desire is called Application Software.
 Application software is a collection of
related programs designed to perform a
specific task, to have a particular problem
for the user. The task or problem may
require, for different types of files.
 A wide variety of software exists to help you
accomplish many tasks on your computer.
Note: Application Software is installed over
platform.
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9.  The physical parts of computer which can be
seen and touch is called Hardware.
 A computer’s hardware consists electronic
devices. The term “device” refers to any piece
of hardware used by computer, such as
keyboard, mouse, modem, printer, scanner
etc.
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10.  A computer system like any other system receives
input, process the input, delivers the processed
inputs as output. It receives data as input and
processes it into useful information as output.
 Following are the physical parts of computer system.
These different parts perform one or more functions
including input, output, processing, etc.
1. System Unit (CPU)
2. Monitor
3. Keyboard
4. Mouse
5. Printer
6. Scanner
7. Speakers
8. Webcam
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11.  The CPU is also known as System
Unit. CPU is the most important
component of computer.
 CPU processes data and gives result
as output.
 It houses your computer’s brain disk
drives and many other components
which makes it “mother ship” of
computer.
 The purpose of processing device is
to retrieve, interpret, and direct the
execution of software instruction
provided to the computer.
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12.  Front Side:
The front side of the system
unit is where we insert CDs,
DVDs and where is on/off,
restart button etc.
 Back Side:
The back side of system unit
is where all the peripheral
(I/O) devices are connected.
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13.  The inside of your computer has many parts
that all work together. These parts are
generally found within your computer case.
 Some of them are given bellow:
 Motherboard
 Microprocessor
 Hard Disk
 RAM
 CD/DVD Rom
 Power supply
 Power Cables
 Slots etc
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14.  Monitor is one of output device. Computer
electronically transmits words and pictures to
your monitor.
 An instrument that records or shows digital
information is called Monitor.
 A monitor is a computer display and related
parts packaged in a physical unit that is
separate from other parts of the computer.
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15.  There are two types of monitor.
1. CRT Monitors
2. LCD Monitors
 CRT Monitor:
Many lower priced systems use
traditional Cathode Ray Tube
(CRT) monitors.
 LCD Monitor:
Newer flat-screen monitors use
an Liquid Crystal Display (LCD)
display inserted, which takes
less desk space.
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16.  The keyboard is look and work just like a
typewriter, but it has more keys than
typewriter.
 It is an input device which is used for
inserting data, writing or typing.
 Standard keyboard has more than 100 keys
which is used commonly now a days.
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17.  A mouse is an output device which
is used for pointer, when you move
mouse along a flat area, on screen
pointer moves. When you click a
mouse button, this motion initiates
an action in computer.
 The functions of Mouse are:
1. Pointing
2. Clicking
3. Double Clicking
4. Right Clicking
5. Dragging
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18.  A printer is an output device which is used for
printing documents, letters, applications,
certificates etc.
 Printer is used for permanent records of
work. Dot Matrix
Inkjet
Types of
Printer LaserJet
Printer
Snapshot
Plotter
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19.  Basically scanners are used for scan from
hard copy into soft copy (Pictorial Format).
 Every scanner has a variety of specifications,
including resolution, color depth and speed.
These specifications will help you determine
the best use for the scanner.
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20.  Speakers are used to listen sound form
electronic device.
 A system comprised of drivers and a
crossover network that accepts an audio
signal from an amplifier and transforms that
electrical signal into acoustic sound.
 It converts an electrical signal from an
amplifier into sound waves.
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21.  A webcam is designed for use with a
computer, as to transmit images, often,
specific live video, images, over a website is
called Webcam. A live camera is one that is
continually providing new images that are
transmitted in rapid succession or, in some
cases, in streaming video.
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