What is WWW (World Wide Web)?

(a)        WWW or W3 stands for the World Wide Web. The World Wide Web is an  information retrieval system based on a set of inter-linked hypertext documents             residing on HTTP servers all over the world.

            (b)        Hypertext Transfer Protocol (HTTP) is the protocol used on the World Wide Web to transport web pages and the data associated with them. A URL that begins

with httpretrieves a web page specified by the URL. For example, http://www.vispl.com is the World Wide Web address of VISPL.

            (c)        Tim Berners-Lee developed W3 in 1989 for the European Laboratory for   Particle                   Physics (CERN).

(d)       Hypertext words or areas on the screen are expandable, leading to more details about a subject. WWW hypertext documents contain embedded links to information spread throughout the world. As one link is selected and then another and another, a web of interrelated information gets built.

            (e)        The W3 uses Client-Server technology. Web servers distributed throughout the                       Internet, store hypertext documents, which contain links to additional Internet   resources. A             Client program, called a Web browser, downloads Web documents as   well as the codes                  required for accessing any links that appear in the document.

1.         File Transfer Protocol (FTP)              FTP was designed to move files between two computers on a TCP/IP network. IIS supports FTP through Windows Sockets. FTP uses TCP as its transport protocol for all communication and data exchanges between the client and the server. However, IIS communicates with Windows Sockets, and then Windows Sockets interfaces with TCP.

2.         Methods of Communicating on Net                 There are different "types of communication" available to Internet user with Internet account. They are :-

(a)   Electronic Mail (E-mail)

(b)   Newsgroups

(c)   Telnet  

Electronic Mail          It let's you send messages, documents, even voice and video to people, anywhere in the world. Many businesses are finding that E-mail is becoming more important than the Fax for them to stay in contact with their customers.

Newsgroups        They operate as Electronic Message Boards and discussion groups. Although they do not really contain news, newsgroup information on almost any subject.

Telnet          It is an Internet exploration tool that allows your computer to connect to another Network for remote terminal connection. By providing terminal emulation via TCP , it allows a user of one host to log in to a remote host and interact as a normal user there. It is widely used to access databases and explore public access computer systems.

3.         Dial-up Networking

(a)        Dial-up networking is a Win-98 component that allows connecting, to a      network by using modem.

(b)        To Install Dial-Up Networking, follow the steps-

(i)   On your desktop click the Start button; go to Settings and then Control Panel.

    

(ii)   In the Control Panel dialog box, select Add Remove Programs icon.

(aa)     In Add Remove Programs PropertiesDialog Box, choose Windows Setup Tab and then Communications option.

(ab)    Make sure that Dial-Up-Networking option is checked in the Communications box.

(c)   Click Apply to add the Dial-up Component.

4.         World Wide Web      The Internet is a global "Network of Networks". It is a massive collection of Computers that connects millions of Computers, People, Software Programs, Databases and Files

5.         Uses of WWW           Like many Internet tools, the WWW uses Client/Server Architecture Web servers distributed throughout the Internet store Hypertext documents, which contain links to additional Internet resources. A client program, called a Web Browser,  downloading Web documents, as well as the codes required accessing any links that appear in the document.

6.         Advantages of World Wide Web Include

(a)        A link in a Web Document can be used to open other documents.

(b)        Web Pages can contain pictures, buttons and even links to sound files, in addition to text, thus allowing Multimedia applications.

(c)        Sophisticated Web Documents allow the user to interact with the applications        through Dialog Boxes and Forms.

7.       WWW Browsers.

(a)        Web Browsers are Software Packages that display Web page containing Text, Graphics, Audio and Video files and links to various other pages, and makes the connection necessary to follow Hypertext Links.

(b)        The information returned using Browsers can be incorporated document or can be                 saved as files.

(c)        The best browsers have additional features that save time and make it         easier to                navigate and use the resources of the web.

8.       Browsers.

(a)        Graphic Oriented    Graphical browsers display images, as well as text, and offer Hyperlinks to multimedia resources, including sound and video files. For Example- Netscape Navigator , Internet Exp lorer , Mosaic, Eudora.

            (b)        Text-Oriented       Text oriented browsers enables us to follow web            Hypertext               links but do not display non-text web resources. For Example-Linux

9.       Browser plug-Ins.

(a)        Browser is capable of retrieving and displaying information in a variety of text and                  graphic formats. However the Internet’s Web servers may contain a wide      variety of file                   formats that are beyond a browser’s ability to handle. 

            (b)        There are two ways a browser can be modified to handle these diverse file                              formats

(i)   Helper Applications     It works as a distinct application, separate from           the              Browser.

            (ii)   Plug-In Application    Plug-in application actually expands the                                           functionality of the browser software as required to handle a particular file.