by Dinesh Thakur

Defination of Internet or simply "the Net" is a worldwide "network of networks". This was the next step of ARPANET and NSFNET. The World Wide Web (www) or called "the Web" is the information-sharing model of the Internet. The internet can be defined as wired or wireless a decentralized network of over million of smaller heterogeneous networks consists of a set of national, regional and private. The internet is the common language whereby dissimilar computers with various operating systems, are able to communicate with each other, using a standard set of protocols.

What is internet

The 'Internet' is the world's largest network, a distinction it has earned by virtue of being a "network of networks." The Internet is an outgrowth of a network (ARPANET) established roughly a quarter-century ago to meet the needs of researchers working in the defense industry in the United States and a few of their colleagues in other countries.              Internet

The ARPANET grew slowly, from a handful of computers in 1971 to more than 1000 in 1984. Working with the ARPANET researchers came to regard high-speed computer networks as an indispensable tool for academic research in all fields, and in 1986 the US National Science Foundation established NSFNET to provide network connections to more research institutions and improve international network cooperation. in 1987, the Internet served more than 10,000 computers. By 1989 the network had grown to more than 100,000.

The protocol used by the 'Internet' for getting messages from one machine to another is called the Internet Protocol (IP). The Internet Protocol is a network protocol, and its job is to manage the logistics of getting a message from the sending machine to the receiving machine.

Who Owns the Internet?

There is nobody who owns Internet or no company called the "Internet". Think of the Internet as the Universe and your computer as a planet, which is a part of that Universe.

Applications of Internet

• Traditionally the internet has the following applications.

1) E-mail

2) News

3) Remote login

4) File transfer

5) World wide web (www).

Evolution of Internet

• The origin of Internet can be traced to a U.S. Department of Defense (DoD) organization called Advanced Research Projects Agency (ARPA).

• ARPA developed a four node packet switching. network called ARPANET in 1969. The network was intended to support the military research on fault tolerant computer networks. DoD wanted to ensure a reliable data transfer in the event of a nuclear war, even if parts of the network has been destroyed.

• As the years pass by, the network grew in size and by 1st January 1983, the ARPANET no longer remained an experimental network but its control was passed over to Defense Communications Agency (DCA).

• The network then became available for the academic research, government employee and contractors.

• .It was not until 1986, however that the dramatic growth of the Internet began. At this time, the National Science Foundation (NSF) which formed the National Science Foundation Network (NSFNET) linked five of its regional super-computer centers together to provide a national high speed backbone network across the United Sates.

• The world's fastest and most powerful computers were made available to a academic and scientific community.

• In 1990 the ARPANET was officially decommissioned. Some of the major networks contributing to the growth of the internet are as follows:


• USENET (User's network)

• CSNET (Computer science network)

• BITNET (Because it's time network)

• NSFNET (National science foundation network)

• WWW (World Wide Web)

• NREN (National research and education network)

• Intranet

• It is said that the Internet is growing at a rate of 20% per month. The data speeds have gone up considerably, which makes the access even faster.

• The event which started as a military assistance program is now largely a private enterprise.

Services on the Internet

The services that are available on the Internet can be classified into two categories:

• Communication services (electronic mail (e-mail))

• Information retrieval services ( Web (pages with links and multimedia content of its Web sites))

They can be further classified as shown in Fig.                           Classification of Services on Internet

• The person to person service includes E-MAIL. This is the most popular service and the most of the Internet traffic corresponds to the E-mail.

• The person to group service includes on line discussions between a user and many other participants from around the globe. A user can choose his topic of discussion from a list of more than 25, 000 topics.

• The fast spreading popularity of the Internet is basically due to the information retrieval services.

(i) The World Wide Web (www), which is world's largest and ever-growing data base.

(ii) FTP or file transfer protocol, which allows remote accessing to the tiles which contain programs, technical handouts, reports etc.

(iii) Telnet or remote login to commercial services.

About Dinesh Thakur

Dinesh ThakurDinesh Thakur holds an B.SC (Computer Science), MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to Contact us.

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