This document provides an introduction to the internet. It defines internet as a global system of interconnected computer networks that use the Internet protocol suite (TCP/IP) to link devices worldwide. The document then discusses the evolution of the internet from its origins as ARPANET to today's worldwide network. It also covers internet infrastructure, users, characteristics, applications and protocols like HTTP, FTP, TCP/IP etc. In addition, it discusses important internet tools and services like email, search engines, internet protocols and more.

1. INTRODUCTION TO
INTERNET
Presented by-
1. Pranav Sharma (Roll No.- 1653)
2. Navdeep Sidhu (Roll No.- 1639)
3. Tushar Gambheer (Roll No.- 1447)
4. Sachin Dhingra (Roll No.-1634)
5. Harjot Singh (Roll No.-1624)
6. Shivam Gupta (Roll No.-1635)

3. WHAT IS INTERNET?
Internet is a communication system that
allows computers around the world to
communicate and to exchange data
with each other.
It also allows access to resources such
as files, services and people.

4. EVOLUTION OF INTERNET
Internet is world wide known largest
computer network, linking millions of
computers from ARPANET to internet 2.
Originally the internet began with the
experimental project called ARPANET
(Advanced Research Project Agency).

5. ARPANET was created in 1969 by US
department of defense project agency.
Internet infrastructure now a days can
be used for variety of purposes.
One of the most widely used internet
resources is the www (world wide
web).

6. THE INTERNET COMMUNITY
Today’s Internet Community is comprised of people from
various profession. Most members of the internet fall into
following groups:
 Users: they are the people who use internet for activities
such to look up telephone numbers, browse through
catalogs, make an online purchase or send an email.
 ISPs (Internet Service Provider): They are often
called as service provider or access provider which provide
internet access for a fee.

7. CHARACTERISTICS OF INTERNET
 Complex Network: Internet is a huge set of network
connected together that is hundred separate internet
networks meet at network access point to exchange data.
 Dynamic in nature: The internet is changing no
applications and technology keeps changing. There are
different organization working on the next generation of
the internet.
 Internet covers globe: Internet is accessible by all the
people across the globe in over 155 countries.

8.  Wider application accessibility: the internet offers
access to data , graphics, sound thorough variety of services
and tools for communication and data exchange.
 Growing exponentially: Internet joins a set of 1 or more
networks everyday the expansion rate of internet is 12% per
month.

9. ANATOMY OF INTERNET
The internet is hierarchical in structure . At the top there
are very large ISPs such as VSNL and DSL .these
national ISPs connect together and exchange data at
NAP.
The local ISPs are responsible for providing connectivity
to individuals due to exponential growth of ISPs, another
form of NAP emerged-metropolitan area exchange.
MAEs are responsible to link ISPs , whose networks are
connected in major cities.

10. High-band Width Fiber Optics
NAP
MAE
Regional ISPs
University User Level Corporate
Basic Internet Architecture

11. OWNER OF INTERNET
There is no single that operates internet. It is not own by a
single owner. Internet society (ISOC) is the closest as
owner of internet.
ISOC is an open membership professional society with
over 175 organizations and nearly 9000 individual
members. ISOCs critical mission is to work for internet
development. Thus it addresses main 3 issues:
 Public Policy: They frame policies regarding
copyright, privacy access and membership.

12.  Education and Training: In order to improve
internet infrastructure in developing countries
ISOC deliver education and training programme.
 Maintaining standards: ISOC works typically
for development and maintenance of internet
standards.

13. ISOC works through 4 worldwide known inter
related standard bodies, these are:
 Internet Engineering Task Force (IETF)
 Internet Engineering Steering Group (IESG)
 Internet Architecture Board (IAB)
 Internet Research Task Force (IRTF)

14.  Businesses use the internet to provide access to
complex data basis such as financial databases.
 Companies carry out electronic commerce including
advertising, selling, buying, distributing product and
providing after sale services.
 Businesses and institutions use the internet for voice
and video conferencing and other forms of
communications that enables people to
telecommunicate.
Uses Of
Internet

15.  The use of electronic mail (e-mail) over the
internet has greatly speeded communication
between companies among coworkers and
between other individuals.
 Media and entertainment companies use the
internet to broadcast audio and video including
live radio and television programmes.

16. “The World Wide Web is a set of
programs , standards and protocols
that allows the multi media and
hypertext files to be created
displayed and linked on the
internet.”

17.  User Friendly : www resources can work easily
with most internet browsers which are user
friendly.
 Multimedia Documents : information on the web
, which maybe graphics, audio, video
animations and text is viewed in pages.
 Hypertext and Hyperlinks : Hypertext file is a
document that can incorporate text, graphic
images, audio and video tracks, and most
importantly , dynamic links to related files and
documents, even on net.

18.  Interactive : www, with its pages,
supports and enables interactivity
between users and servers through one
or more of the following.
* Hyperlinks
* Input Boxes examples radio buttons,
checkboxes, etc.
 Frames : WWW also supports frames.
Frames is the display of more than one
independently controllable section on
single webpage.

19.  A web browser is a www client that
navigates through the world wide web
and displays web pages.
 A web server is a www server that
responds to the request made by web
browsers

21. A location on a net server is called a
website. Each website has a unique
address called URL ( Uniform
Resource Locator ) eg. The website of
Microsoft has an address or url called
http://www.Microsoft.com

22. The Document residing on
website are called webpages.
The web pages use http

23. Homepage : It is the top level
webpage of a website.
Web Portal : It is a website, which
host other websites and many
other services such as email,
people search, user group,
forum, etc.

24. The hypertext transfer protocol is an
access method used on internet. It is
the primary access method for
interacting with internet. Http generally
works with combination www.

25.  An intranet is a network that exists
exclusively within an organization and that
is based internet technology.
 Because an intranet is based on internet
technology it can have thousands of users
across many locations and still be private.

26. Net etiquette is a term used to
describe acceptable behavior
on the internet, be it in regards
to email , news , mailing list or
whatever.

27.  Don’t participate in Flame Wars.
 Don’t respond to any Make Money Fast
postings.
 Respect other people’s privacy.
 Don’t say anything in email that you wouldn’t
want your grandmother to read.
 All email should end with a short signature line.

28.  After connecting your Pc to internet, you
are ready to retrieve information from
net. But for this , you need an important
software called browser.
 A Brower is a program which leads to
visit different website on internet and
display their offering on your computer.
 Exploring a net is called net surfing.

29. Electronic Mail
The most widely used tool on the internet is
electronic mail or e-mail. It is used to send written
messages between individuals or group of
individuals often geographically separated by large
distances. E-mail messages are generally sent from
and received by mail servers – computers that are
dedicated to processing and directing e-mail.
Once a server has received the message it directs
to the specific computer that the mail is addressed
to.

30. E-mail Address
Although sending and receiving mail is
extremely simple ,there are few parameters that
you must be clear about before sending and
receiving e-mail. One such parameter is e-mail
address.
E-mail addresses commonly take this form
username@hostname { like
pacasa@Hotmail.com, paca@del6.vsnl.net.in }
Here, before the character “@” the e-mail
account holders net name appears and after
“@” the name of the net server appears which
host the e-mail address.

31. Advantages of E-Mail
Low Cost : electronic mail is an extremely cost-
effective way to move information around.
Speed : electronic mail can be delivered almost as
fast as the wire can carry it.
Waste reduction : email goes a long way towards
reducing the clutter of paper in the modern office.

32. Ease of use : it is easy to send an email. You
don’t have to retype it three times, find an
envelope, go to the corner to buy a stamp,
and then find a mail box.
Record maintenance : because all messages
are files, you can automatically maintain a
record of communication.

33. Limits of E-mail
 Hardware Requirement : You have to be at a
computer to read or print email.
 Impermanent : Your sent mail message can be
altered in all the ways that operating system
offers.
 A hasty medium : Because email is so easy to
use, it is also easy to send a message that you
later regret.
 Hard to convey emotions : without extra cues of
voice, posture and expression, it is easy to
misunderstand what someone really means a
message.

34. How To Create An E-Mail
Account

37. How to send a mail
Open your mail account.
In the top left, click Compose.
In the "To" field, add recipients. If you
want, you can also add recipients in the
"cc" and "bcc" fields.
Add a subject.
Write your message.
At the bottom of the page, click Send.

39. What is CC And BCC
CC : the carbon copy i.e. CC allows you
to send the same mail message to
multiple recipients at the same time.
BCC : Blind Carbon Copy i.e. BCC allows
the sender to send same mail message
to multiple recipients without letting them
that some other persons have also
received the same message.

40. Search Engines
 It is basically a type of program that uses
keywords to search for documents that relate to
these keywords and then puts the results found in
the order of relevance to the topic that was
searched for.
 Examples :-
1. Google
2. Alta Vista

41. Importance of search
engines
 Search engines are important because with over
8 billion web pages available, it would be
impossible to search for the information that is
specifically needed. This is why search engines
are used to filter the information that is on the
internet and transform it into results that each
individual can easily access and use within the
matter of seconds.

42. Types of search
engines
 Crawler based search engines
Directories
Specialty search engines
Hybrid search engines
Meta search engines

43. Crawler based search
engines
Are search engines that use software programs
that are called, “Spiders”, “crawlers”, “Robots”,
“Bots”. These programs can access the webpages
to categorize and analyze them and then add them
in the search engine data base, where any user
can find them when searching.

44. The Crawler based search engines are
constantly updated with new webpage that
would be available in their database.
Examples:-
1. Google
2. Yahoo
3. Ask.com

45. Directories
Are websites sectioned in specific
categories by human editors and are then
place in the “Directories” database.
Examples:-
1. Yahoo Directory (www.yahoo.com)
2. Open directory (www.dmoz.org)

46. Specialty search
engines
They help the user search in different areas in
specific types of lists that are specialized in
specific topic that would be beneficial for narrowing
down the searching process.
Examples:-
1. AskJeeves (Question and answer search
engine)
2. Medhunt (Provides only medical information)

47. Hybrid search
engines
Are search engines that use both crawler
based searches and directory searches to
obtain their results.
Example:-
1. Yahoo.com
2. Google.com

48. Meta search engines
Are search engines that combine all the
results from other search engines into one
big list.
Examples:-
1. Metacrawler
2. Dogpile

49. How to use search
engines
Be specific:
When searching on a search engine be more
specific in wording, such as using school science fair
projects instead of science projects.
Use the + symbol and - symbol:
If you want to use two words in a search, you can
use the + symbol before each word so that only web
pages that have both words appear. Example: +fruits
+vegetables. On the other hand you can use

50. the – symbol if you are looking for a topic such as
Shakespeare and just want to search for his novels
you can search for it as – Shakespeare –novels. The
result will have only information that you need and
no info that is irrelevant to the topic.
Use Quotation marks:
The quotation marks are used if you want to search
for specific phrases. Example: “Mark Kerkorian
biography”
Combining symbols:
you can combine all the symbols explained above
to do the search your own way.

51. Refining the Search
We can significantly improve searches by
using operators and wildcards in search
strings. The major search engines allow the
user to choose whether to search for the
exact typed phrase, all the word in the
phrase, any of the words phrase and so on.

52. Main Operators
AND- it is used to search for two or more
terms on the same page. Ex- apple AND
orange.
OR- it is used to search for either of two
terms on the same page. Ex- global OR
warming.
NOT it is used to search for pages that
include the first term but not the second.
Ex- cats NOT dogs.

53. Internet
Protocol

54. A protocol means the rules that are applicable for a network.
Protocol defines standardized formats for data packets,
techniques for detecting and correcting errors and so on.
A protocol is “ a formal description of message formats and
the rules that two or more machines must follow to
exchange those messages.”

55. List of Protocols
➢ HTTP (Hypertext transfer Protocol) :- The HTTP is an
application-level protocol with the lightness and speed
necessary for distributed, collaborative, hypermedia
information systems. It is a object-oriented protocol
which can be used for many tasks.
The HTTP protocol consists of two fairly distinct items :
the set of requests from browsers to servers and the set
of responses going back to the other way.

57. ➢FTP (File Transfer Protocol) : The FTP is a
standard network protocol used to
transfer computer files between a client and
server on a computer network.
The objectives of FTP are :
➢to promote sharing of files
➢To encourage indirect or implicit use of remote
computers
➢To shield a user from variations in file storage
systems among hosts , and
➢To transfer data reliably and efficiently.

59. ➢TCP/IP (Transmission Control Protocol/Internet
Protocol) : TCP/IP is the basic communication
language or protocol of the Internet. It can also be
used as a communications protocol in a private
network.
TCP/IP uses the client/server model of
communication in which a computer user (a client)
requests and is provided a service (such as
sending a Web page) by another computer (a
server) in the network.

61. ➢SLIP (Serial Line Internet Protocol) : SLIP was
the first protocol for relaying IP packets over dial-
up lines. It defines an encapsulation mechanism,
but little else. SLIP has been largely supplanted
by PPP.
➢PPP (Point To Point Protocols) : PPP is the
internet standard for transmission of IP packets
over serial lines. PPP is a layered protocol,
starting with a Link Control Protocol (LCP) for link
establishment, then Network Control Protocols
(NCPs) for traffic transportation, and then IP
Control Protocol (IPCP) that permits the transfer
of IP packets over a PPP link.

62. Some Other Protocols :-
➢NTP (NETWORK TIME PROTOCOL) : The NTP
is used to synchronize the time of a computer
client or server to another server or reference time
source, such as a radio or satellite receiver or
modem.
➢SMTP (Simple Mail Transfer Protocol) : SMTP
is internet’s standard host-to-host mail transport
protocol and traditionally operates over TCP.
Though SMPT is fast and efficient, and does a
great job, but has one drawback – it expects both
nodes to be online simultaneously.

63. ➢ POP (Post Office Protocol) : POP is a mail
collection and distribution system that allows the
creation of a mailbox or ‘maildrop’, for each user
who has a mail account on the server. SMTP is
used to transfer mail between two permanently
online hosts, and POP to store the information
until it is collected.
➢IMAP (Internet Mail Access Protocol) : IMAP
is currently evolving into a replacement for the
POP protocol. Unlike POP, IMAP allows
hierarchical storage of mail and a message
retrieval system that allows selective access to
mailbox. IMAP allows users to keep track of
message status information.

64. Uses of internet to the
society
To find general information about the subject
To access information easily available
everywhere
To correspond far away friends
To meet people
To learn
To make news
To buy things
To advertise
To interact one another