Introduction to computer

1. COMPUTER APPLICATION ASSISTANT
K72S003
University College of Jaffna
Lecture 01
INTRODUCTION
1.1 Introduction to Computer
K.Thiruthanigesan, BSc.
University College of Jaffna,
University of Vocational Technology,
Jaffna.

2. Introduction to Computer
What is Computer ???
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K.Thiruthanigesan University College of Jaffna

3. An electronic device which is capable of
receiving information (data) in a particular
form and of performing a sequence of
operations in accordance with a predetermined.
Such as variable set of procedural instructions
(program) to produce a result in the form as
information or signals.
What is Computer ???
Information and Communication Technology University College of Jaffna
K.Thiruthanigesan University College of Jaffna

4. Introduction to Computer
What is programming language ??
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K.Thiruthanigesan University College of Jaffna

5. A programming language is a formal
constructed language designed to
communicate instructions to a machine,
particularly a computer. Programming
languages can be used to create programs
to control the behavior of a machine
What is programming language ??
Information and Communication Technology University College of Jaffna
K.Thiruthanigesan University College of Jaffna

6. Introduction to Computer
What is input device ??
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K.Thiruthanigesan University College of Jaffna

7. Any machine that feeds data into a computer.
Eg: Keyboard
Mouse
Scanner
Barcode Reader
What is input device ??
Information and Communication Technology University College of Jaffna
K.Thiruthanigesan University College of Jaffna

8. Introduction to Computer
What is Output Devices ???
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K.Thiruthanigesan University College of Jaffna

9. Any machine capable of representing
information from a computer. This includes
display screens, printers, plotters
What is Output Devices ???
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K.Thiruthanigesan University College of Jaffna

10. Introduction to Computer
What is RAM???
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K.Thiruthanigesan University College of Jaffna

11. Random Access Memory (RAM) is a type of
data storage used in computers that is
generally located on the motherboard. This
type of memory is volatile and all information
that was stored in RAM is lost when the
computer is turned off.
What is RAM???
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K.Thiruthanigesan University College of Jaffna

12. Introduction to Computer
What is Volatile Memory???
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K.Thiruthanigesan University College of Jaffna

13. Volatile memory is computer storage that only
maintains its data while the device is powered.
Most RAM (random access memory) used for
primary storage in personal computers
as volatile memory.
What is Volatile Memory???
Information and Communication Technology University College of Jaffna
K.Thiruthanigesan University College of Jaffna

14. Introduction to Computer
What is Non Volatile Memory???
Information and Communication Technology University College of Jaffna
K.Thiruthanigesan University College of Jaffna

15. non-volatile memory include read-
only memory, flash memory, most types of
magnetic computer storage devices (e.g. hard
disks, floppy disks, and magnetic tape), optical
discs, and early computer storage methods
such as paper tape and punched cards.
What is Non Volatile Memory???
Information and Communication Technology University College of Jaffna
K.Thiruthanigesan University College of Jaffna

16. Introduction to Computer
What is Operating System???
Information and Communication Technology University College of Jaffna
K.Thiruthanigesan University College of Jaffna

17. An operating system is the most important
software that runs on a computer. It manages
the computer's memory, processes, and all of
its software and hardware.
What is Operating System???
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K.Thiruthanigesan University College of Jaffna

18. Introduction to Computer
What is Software???
Information and Communication Technology University College of Jaffna
K.Thiruthanigesan University College of Jaffna

19. Software is a general term for the various
kinds of programs used to operate computers
and related devices.
What is Software???
Information and Communication Technology University College of Jaffna
K.Thiruthanigesan University College of Jaffna
Software Examples
Internet browser
Firefox, Google Chrome, Internet
Explorer
Movie player VLC, Windows Media Player
Operating system
macOS X 10, Windows XP,
Windows 7
Photo / Graphics program Adobe PhotoShop, CorelDRAW

20. Introduction to Computer
What is Hard disk???
Information and Communication Technology University College of Jaffna
K.Thiruthanigesan University College of Jaffna

21. A hard disk drive is a hardware device that's
used to store information like software and
files
What is Hard disk???
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K.Thiruthanigesan University College of Jaffna

22. a browser is a software application used to
locate, retrieve and display content on the World
Wide Web, including Web pages, images, video
and other files. As a client/server model, the
browser is the client run on a computer that
contacts the Web server and requests
information. The Web server sends the
information back to the Web browser which
displays the results on the computer or other
Internet-enabled device that supports a browser.
Mozilla Firefox, Google Chrome, Microsoft Internet Explorer, Apple Safari and the
Opera browser.
WEB Browser
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K.Thiruthanigesan University College of Jaffna

23. Search engines are programs that search
documents for specified keywords and returns a
list of the documents where the keywords were
found. A search engine is really a general class of
programs, however, the term is often used to
specifically describe systems like Google, Bing and
Yahoo! Search that enable users to search for
documents on the World Wide Web.
Search Engines
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24. Hard copy means a printout of data stored in a
computer. It is considered hard because it exists
physically on paper, whereas a soft copy exists
only electronically.
Hard copy
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25. A soft copy is an electronic copy of some type of
data, such as a file viewed on a computer's
display or transmitted as an e-mail attachment.
Such material, when printed, is referred to as a
hard copy .
Soft Copy
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26. A collection of data or information that has a
name, called the filename. Almost all information
stored in a computer must be in a file. There are
many different types of files: data files, text files ,
program files, directory files, and so on. Different
types of files store different types of information.
For example, program files store programs,
whereas text files store text.
File
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K.Thiruthanigesan University College of Jaffna

27. In computers, a folder is the virtual location for
applications, documents, data or other sub-
folders. Folders help in storing and organizing files
and data in the computer. The term is most
commonly used with graphical user interface
operating systems.
Folder
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K.Thiruthanigesan University College of Jaffna