The document summarizes key information about the internet. It discusses the origins of the internet from the ARPANET network developed by the US Department of Defense in 1969. It allowed multiple users to simultaneously send and receive information over communication paths. Universities were later allowed to join, developing software and giving birth to the modern internet. The document outlines purposes of computer networks like facilitating communication, sharing hardware and files. It lists advantages like serving as a virtual private network for organizations and a communication channel for marketing. Risks discussed include theft of personal information and virus threats.

1. Internet
Presented
By
Dr. K. Punitha Devi
Head & Asst. Prof. of Commerce(CA)
Bon Secours College for Women,
Thanjavur.

2. Why Internet
Kavitha transfers money from their savings
account to Seetha’s account in Pondicherry using
the computer. Usually this is done once a month.
But if Seetha needs cash urgently, she sends an e-
mail and the money is immediately transferred
irrespective of the time(any time of the day) and
place (from office or home).
To pay the Telephone bill, Electricity bill, Places to
visit, Hotels to stay, restaurants to eat, shops to go
etc.

3. History of Internet
In 1969, the Department of Defense of United States of America started
a network called ARP net (Advanced Research Projects Administration
network). This network was set up for the military purpose. It began in a
modest way with one computer in California and three in Utah.
The primary goal of ARPANET was to allow multiple users to send and
receive information simultaneously over the same communication path. The
network operated with a technique called packet switching using TCP.
Later, to share the software and hardware resources, the military
allowed universities to join the network from where the students caught up
with it and developed much of the software, giving birth to the now so very
popular internet.

4. This ARPANET was divided into two parts MILNET and ARPANET.
MILNET was used for military related sites and ARPANET for non-military
sites. These two networks were connected together by using IP Internet
Protocol. The combine set op protocol is called TCP/IP.
During the 1970’s networks like the BITNET and the USENET came into
being. Around 1980’s NSFNET (National Science Foundation Network) was
created. This growing web was the birth of the network.

5. Introduction & Meaning of Internet
Introduction:
A computer network, often simply referred
to as a network, is a collection of computers and
devices interconnected by communications
channels that facilitate communications among
users and allows users to share resources.
Meaning:
Internet is an inter-connection between several
computers of different types belonging to various
networks all over the globe. It is a network of
network.

6. The kind of colossal powers that the Internet gives your machine is
mind-bogging. To send or receive data within a matter of seconds to
someone placed beyond the Pacific was unthinkable before the advent of the
Internet. The Internet represents the transformation and evolution of the
entire information age. It is due to these factors that people all over the globe
have recognized the internet as their latest developmental tool.
The internet unleashes the power to communicate unlike any other
novelties. The Internet is making a major impact on the information
technology industry. Major companies like Microsoft, AT&T, Intel and IBM
have reworked their business strategies vis-a vis the Internet.

7. Purpose
Computer networks can be used for several purposes:
 Facilitating communications.
 Using a network, people can communicate efficiently and easily via email,
instant messaging, chat rooms, telephone, video telephone calls, and video
conferencing.
 Sharing hardware.
 In a networked environment, each computer on a network may access and use
hardware resources on the network, such as printing a document on a shared
network printer.
 Sharing files, data, and information.
 In a network environment, authorized user may access data and information
stored on other computers on the network. The capability of providing access to
data and information on shared storage devices is an important feature of many
networks.
 Sharing software.
 Users connected to a network may run application programs on remote
computers.
 Information preservation.

8. Advantages
• As a Network:
Organizations can use the internet to link their offices
and employees, turning the internet into a virtual private network.
• As a Medium:
The internet serves as a communication channel for anybody
dealing with product marketing to corporate communications.
• As a market:
The internet is a vast virtual market place you can advertise
and even order products from the market.
• As a Transaction Platform:
The internet allows you complete your business transactions
in the market place; i.e. you complete your financial transaction
online while linked directly to your suppliers, customers or
financial institutions.

9. Disadvantages
Theft of Personal information
Negative effects on family communication
Internet addiction
Children using the Internet
Virus threat

10. Thank You