World Wide Web

World Wide Web                                      .

World wide web  (called WWW or W3 in short) is the most popular and promising method of accessing the l reason for its popularity is use, of a concept called hypertext. Hypertext is a new way of information " internet that enables authors to structure ‘information in novel ways. An effectively designed can help users locate’ desired type of information rapidly from vast amount of information on tt documents enable this by using a series of links. A link is shown job screen in multiple t labeled button, high lighted text, or different color text than normal text if your computer has color r-defined graphic symbols. A link, is a special type of item in a hypertext "document connecting another document that provides more information about the linked item. The latter document can the Internet (in the same document in which the linked item is, on the same computer in which the is, or on another computer at the other end of the world)* By "connect", we mean that a user selects the linked item (using a mouse or key command) and the user sees the other document on his/her ;r terminal almost immediately.

jpg of hypertext can be best illustrated with an example. Let us *tissue that following hypertext it is currently displayed on your computer's screen:-

Hypertext document has following two links shown on screen as highlighted (bold and underlined) texts:

1.     Centre for Development of Advanced Computing (C-DAC). Let us assume that this link connects
the current document to another document giving detailed information about C-DAC, and is located
on a computer system at C-DAC information,

2.     Multimedia Systems Research Laboratory (MSRL) of Panasonic. Let us assume that this link
connects the current document to another document giving detailed information about MSRL of
Panasonic, and is located on a computer system at MSRL of Panasonic in Tokyo, Japan.

Now, if you use your mouse to click anywhere on the link

Panasonic of displayed document, within a few seconds you wilt find yourself connected to the MSRL of Panasonic in Tokyo, and the document giving detailed information about MSRL of Panasonic displayed on your computer screen.

Hypertext documents on the Internet are known as Web Pages. Web Pages are created by using a special called Hypertext Markup Language (HTML in short). HTML is a subset of a more generalized language Standard Generalized Markup Language (SGML in short) that is a powerful language for linking easier electronic access and manipulation. HTML is now a de-facto industrial standard for creating Web Pages.;

The  WWW uses client-server it ideal, and an Internet Protocol called Hypertext Transport Protocol (I short) for interaction between computers on the Internet. Any computer on the Internet using the HTTP is called a Web Server, and any computer accessing that server is called a Web Client. Use of client-server and the HTTP allows different kinds of computers on the Internet to interact with each other. For example, a workstation may be a web server and a Windows PC may be a web client, if both of them use the HTTP for transmitting and  receiving information.