Everyone is using Information Technology Knowingly or unknowingly. It is growing rapidly. It covers many different and distinct fields like Movies, wireless phones or internet. IT is used Everywhere in any field. User can use IT, for creating multimedia ,in Business or for creating different magazine or Websites. It not only helps to the organization or to the societies but it is find helpful to the Individual persons. In past days, every thing is Manual Processing for mailing system, preparing reports were carried without electronic machine

1. 1. Introduction to Information Technology
• Definition of Information Technology.
• Application and Limitations of IT.
• Example of IT in Everyday Life.
• Review of Computer Hardware
and User Interface
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Prasanth,SRM university
Last updated:130313

2. Information Technology
Everyone is using Information Technology
Knowingly or unknowingly. It is growing rapidly.
It covers many different and distinct fields like
Movies, wireless phones or internet. IT is used
Everywhere in any field.
User can use IT, for creating multimedia ,in
Business or for creating different magazine or
Websites. It not only helps to the organization or
to the societies but it is find helpful to the Individual
persons. In past days, every thing is Manual
Processing
for mailing system, preparing reports were carried
without electronic machine
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3. Definition of IT
 It enhances our local economy. It help to solving social issue and to
develop community relationship. Use of IT tools is equitable and afordable.
Its uses hardware and softwares along with other hardwares like telephone
line, modems etc. These components helps to connect two computers
together. In short IT provides all facilities like collecting , storing , encoding ,
processing , analyzing , transmitting , receiving and printing text audio
or video information.
Information Technology is a system that process for required output.
IT can be described as a set of elements connect together for Retreiving ,
processing and outputting data in the appropriate Format for the purpose of
common objective.
Continued…..
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4. But now information technology helps everyone to communicate
with each other.
The use an the impact of IT in different fields are different but all
Share the one common thing. That is COMPUTER
Which Helps user in many ways. It gives facility to find , use and
share information and ideas. IT applies modern technologies.Like
1. Recorder
2 CD-ROM
3. Telephone
4. Video
That means IT makes to gather, manipulate, use and share
information. That means technology is used to create store ,
Exchange and utilize information in its various forms including
Data , conversations, different images.
It is use to improve personal or business performance, better
public services and lifestyle. It is just like an engine drive an
Information system.
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5. What is Information system?
Information Technology is a concept. It is
not a hardware part or a device.
It is a technology that helps to process
information. The Information system
which is used to help to build Information
technology is called information system.
Information system is a collection of hardware
and software . It help to perform different
function. eg: Reservation, Admission of School
and College , Education, science and technology
etc. Personal computer is small scale system.
continued….
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6. But it is the most important part or the
hardware used in Information technology.
What is computer Hardware?
In computer the components which we can
see and touch is called hardware.The C.P.U
and peripherals. For eg: keybaord, Monitor,
Printers, Mouse, Headphone, Speakers and
Central Processing Unit etc. are called
computer hardware.
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7. What is Software?
In computer the data or information can
be stored is because of software.
Software helps to user to interact with
Machine. This is because of computer
Software. It allows users to enter data
and after processing to display output.
For eg. MS-office, Games, Windows
application software,DOS, Unix etc. are
different types of softwares
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8. Whatever computer performs, that totally depend
on software. Software means a Set of instructions
that tells to the computer. What to do. Software
controls the operations of the computer.
Without software computer is just a dump
machine.
Software are of two types:-
1. System software
2. Application software.
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9. Hardware and Software
are inter-depented on each other.
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10. System software and Application software
 System software controls computer
programming. It makes computer to start
Or perform useful work or allow loading
different software. Examples are
Dos (Disk operating system),Windows,
Unix etc.
 Application Software is any program that
process data. These are the software used for
specific task. Application system software
excute with the help of operating system.It
Performs specific task like letter formatting,
to be continued….
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11. database manipulating or graphics
presentations etc.
E.g. Ms-Office, Tally etc.
Software used data and proccesses it to
give result.
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12. Data is the information Provided from the
user. It is the output generated by the
computer. Data can be Printed and distributed
from computer.Different Data types are
characters, numbers, other symbols. Data
may be in the any form. It may be letters ,
photos, videos or sound also.
Data is a raw material and final product also.
to be continued….
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13. Data is typed by the user through the
Keyboard. Sometimes user requires to
Transmit videos,sound files or animated
files also. This data is complex to analyze
and process. This Data is called as
Complex data. To compute this data high
Power processor is used. Now a days
with
the help of internet facility voice and
images transferring is also possible.
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14. 1. In Bussiness (website Advertisement etc.)
2. In industry(Robot machine, Inventory control)
3. In Home (shoppng and banking, reservations,
Entertainments etc)
4. Education and training (school and Colleges)
5. Engineering (CAD and CAE main IT Applications)
6. Science and Medicine(Scientist, Physicians,
Astronauts for satellites developments)
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15. 1. Literacy :- Trained and well educated persons are required to
handle and use IT. Illiterate person can not use Technology.
2. Backup:- Every tome back up is necessary. If Computer data is
lost then everything is to be done again.
3. Affect human relationship : Every thing is avialable at home
makes human being lazzy.
4. Unemployement:- Big organisation are changing their
technologies and turning th the new. Due to that les manpower is
Required. This cause increase in unemployement.
5. Increase cost :- The use of new technologies, skilled persons
are Required for the users to give training. They have to be paid
more salary. New technologies causes to increase the product
cost.
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16. Computer in hiding
The system that work behind the scene
need attention. Sometime such system
are on large scale or sometime small scale.
The computer system that works behind
the scene or in hiding.
First consider Large system.
Network of Computers means many computers
are used or many computer are working for any task.
Continued…
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17. Examples:-
1. Online reservation
(railway or airline) contact agent on
internet and book the tickets ina second
with all information about train or
aeroplane. Which give exact information
to the users.
2. Weather Forecasting Or ATM card
Behind this multiple computers and
employees are used as a hidden for giving
proper Information .
continued…
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18. Hidden small computer
system
It is a single electronic device or a single
computer used for specific task.It is a
compact information technology. The best
examples are Mobile phone, watches,
Puch card to record time-in and time-out
of employees in a organisation.
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19. Computer hardware and User
interface
Computer hardware can be bifurcated in two ways.
Internal and External Hardware.
Internal Hardware consist o parts inside the C.P.U
1. Motherboard
Main Processor(interprets instruction and process
Data.)
RAM(Random Access Memory)
Buses (group of electronic wires)
2. Power supply (supply electrical power or energy)
Contiued..
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20. Prasanth , SRM university 20
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21. Prasanth , SRM university 21
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22. 5. Graphic adapter (video adapter)
Use for conversion of logical
representation in signal that are
recognised by computer.
6. Secondary storage devices
a) Hard disk (main Storage device)
b) Removable storage devices like
Floppy disk 1.44MB,
Compact disc near about 700 MB,
Universal serial bus (USB) in different sizes
store upto 16 GB.
continued..
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23. 7. Sound Card:- to transfer signals from
the system to the speakers. Users can
listen sound from computer.
External Hardware helps to build a
complete computer. It is Input and output
Devices.
1.Keyboard 5. Scanner
2. Mouse 6. Joystick
3. Monitor7. Printer
4. Speaker 8. Plotter etc.
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24. Types of Printer
Impact printers
 Daisy Wheel Printer
 Dot matrix Printer
 Line Printer.
A Ink Ribbon is used with different pins.
pins strike the ribbon to print characters
or dot on the paper. These all printers
that works by striking an ink on ink ribbon.
But these printers produce huge sound while
printing.
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25. Types of Printer
Non - Impact printers
1. Inkjet printer
2. Laser printer
3. Plotter for (Map and Graph Designing)
a) flat plotter b) Drum plotter
These Printers produce less noise . No use
of striking pins but heated ink is sprayed on
the paper or Laser beam is use to print text.
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26. A device that draws pictures on paper based on
commands from a computer. Plotters differ from
printers in that they draw lines using a pen. As a
result, they can produce continuous lines,
whereas printers can only simulate lines by
printing a closely spaced series of dots.
Multicolor plotters use different-colored pens to
draw different colors.
In general, plotters are considerably more
expensive than printers. They are used in
engineering applications where precision is
mandatory
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27. User Interfaces
1. CHARACTER USER
INTERFACE
2. GRAPHICAL USER
INTERFACE
3. PEN BASED INTERFACE
4. TOUCH SCREEN
INTERFACE
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28.  CUI – It was the first interface develop
ed for computer. User can only type any
Instructions.e.g DOS COMMANDS.
 GUI – It was introduced in 1980.Now a
days GUI is used as a main interface.It
allows multifunction that user can open
many windows at a time. Get images on
Screen and take same print on paper.
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29.  PUI- This is a new hand held system
uses touch sensitive interfaces. A Stylus
is
Used to write on the screen or to point
Any command or text. For this different
Operating system are used
i.e. Window CE or palm OS
E.g. Palm Digital Assistance.
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30.  TUI – It is an advance Technology
A touch screen is an input device that
allows users to operate a PC by simply
touching the display screen. Touch
input is suitable for a wide variety of
computing applications. A touch screen
can be used with most PC systems as
easily as other input devices such as
track balls or touch pads. Browse the
links below to learn more about touch
input technology and how it can work
for you.
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