STAM 102 :: Lecture 15 :: Internet: World Wide Web (WWW), Concepts


  • Network of interconnected computers around the world.
  • A network of computer networks which operates world-wide using a common set of communications protocols.
  • a computer network consisting of a worldwide network of computer networks that use the TCP/IP network protocols to facilitate data transmission and exchange.
  • Visualization of the various routes through a portion of the Internet:

Image:Internet map 1024.jpg


What do we need to get connected to internet?

  • Getting on the Internet requires:
    • Computer
    • Modem
    • Telephone Line
    • Internet Service Provider (ISP)
    • Communication Software

Modem and Telephone Line

  • Modem is a communications device that allows us to communicate with another computer through telephone lines.
  • Modem is abbreviation of modulator/demodulator.
  • Telephone services, such as
    • ISDN,
    • 56K leased lines, and
    • T-1 connections
  • offer connections to the Internet at considerably faster connection speeds.



Internet Service Provider (ISP)

  • An Internet Service Provider (ISP) is a company that allow you to use their internet connection for a price.
  • When you register with an ISP the followings are given:
    • Username
      • A unique name that identifies you.
    • Password
      • A secret code that prevents other people from using your account.

Some Popular Internet Service Providers

  • AT&T WorldNet
  • Microsoft Network
  • America Online
  • In India:
    • VSNL (Videsh Sanchar Nigam Limited
    • MTNL (Mahanagar Telecom Nigam Limited)
    • BSNL (Bharat Sanchar Nigam Limited)
    • Satyam Onlile

Communication Software

  • Computer needs communicate
  • on software to allow you to get connected to, and interact with, the Internet.
  • Communication software is of two types:
    • Software that Helps Establish Basic Internet Connectivity
    • Software that helps to browse, access e-mail etc.

World Wide Web

"The World Wide Web is the universe of network-accessible information, an embodiment of human knowledge."

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  • Tim Berners-Lee, a scientist at CERN (The European Organization for Nuclear Research (French: Organisation Européenne pour la Recherche Nucléaire), invented the World Wide Web (WWW) in 1989.
  • The Web was originally conceived and developed to meet the demand for automatic information sharing between scientists working in different universities and institutes all over the world.

Highslide JS

  • The basic idea of the WWW was to merge the technologies of personal computers, computer networking and hypertext into a powerful and easy to use global information system.
  • The World Wide Web, abbreviated as WWW and commonly known as The Web, is a system of interlinked hypertext documents contained on the Internet.
  • With a web browser, one can view web pages that may contain text, images, videos, and other multimedia and navigate between them by using hyperlinks.


  • Hypertext is text displayed on a computer or other electronic device with references (hyperlinks) to other text that the reader can immediately access, usually by a mouse click or keypress sequence.
  • Apart from running text, hypertext may contain tables, images and other presentational devices. Hypertext is the underlying concept defining the structure of the World Wide Web, making it an easy-to-use and flexible format to share information over the Internet.

Web Browser

  • A web browser is a software application for retrieving, presenting, and traversing information resources on the World Wide Web. An information resource is identified by a Uniform Resource Locator (URL) and may be a web page, image, video, or other piece of content.
  • Example of Web Browser:
    • Mosaic
    • Internet Explorer
    • Netscape Navigator
    • Mozilla Firefox

Web Page and Websites

  • W3 contains several millions of pages of information. Each of these pages is called a Web Page.
  • A webpage or web page is a document or resource of information that is suitable for the World Wide Web and can be accessed through a web browser and displayed on a computer screen.
  • A web page can contain text, pictures, sound, animation and video.
  • A group of related web pages that are linked together form a Web Site.
  • The first page of a web site is called the Home Page.
  • The Home Page shown below is the Home Page of the official website of Tail Nadu Agriculture University.




Universal Resource Locator

  • Each web page has a unique address called Universal Resource Locator (URL).
  • Contains unique information about the server and the path on the server to find and retrieve the information





protocol – rules through which transmission takes place over the internet.

server name - computer domain name


pathname to the directory you are requesting


filename you are requesting

Search Engine

  • A web search engine is designed to search for information on the World Wide Web. The search results are usually presented in a list of results and are commonly called hits.
  • Few examples of web search engines are:


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