world wide web

WWW (WORLD WIDE WEB)

     The world wide web is the graphical, multimedia portion of the internet. To view files on the web, you need web browsing software such as Firefox or Internet Explorer. You use this software to view different locations on the Web. Which are known as Web pages. A group of web pages is known as a web site. The first page of a web site is often called the Home page.

History of WWW

1. In the 1960’s, Ted nelson popularized the hypertext concept, and Douglas Engelbart developed the first working system.

2. In the 1980’s, the web we known it was developed in Europe by Tim Berners-lee and Robert cailliau.

3. It then rapidly spread around the world over the internet in the 1990’s by Mark Andreessen and the NCSA team that developed the Mosaic and Netscape browsers.

  WWW concepts

  Although many applications have been devised that use the internet, one particular application has evolved that incorporates the best features of others through a single interface. Known as World Wide Web or merely “the web”, is the most popular internet browsing services that used hypermedia. The service is a mechanism that links together information stored on many computers.

 In essence, WWW allows the references in a document on one computer to refer to textual or non textual information stored other computers. For example a world wide web document on a computer in the U.S can contain a reference to a stored video images on a computer in the U.K.

 A user browses the web in the same way that one browses hypermedia document in the single computer. At any time, user’s display shows a document that contains highlighted references. When the user select an item, the system follows the references, obtained the referenced item, and either plays the sound or display the document. Thus a user can browse through the World Wide Web without knowing where information resides.

Hyperlinks                                                                                                                                                                                                   

     A hyperlink is a connection from one page to another destination such as another page or a different location on the same page. The destination is frequently another web page, but it can also be a picture, an e-mail address, a file, or a program. A hyperlink can be a text or a picture.

 When a site  visitor clicks the hyperlink, the destination is displayed in a web browser, opened, or run, depending on the type of destination. For example a hyperlink to an AVI file opens the file in a media player, and hyperlink to a page displays the page in the web browser.

URL’s                                                                                                                                                                                                                

 Just as each household  has a unique address, each web page in the world has a unique Internet address, sometimes called URL (Uniform Resource Locator)      

What is HTTP?

 HTTP stands for Hyper Text Transfer Protocol, the means of communication using links following the exact technological format or protocol.

What is html

  The html you often see at the end of the URL stands for Hyper Text Markup Language, a Language to make pages that take advantage of multimedia-pictures, sound and even film clips. A URL also identifies the protocol that will  handle the file, such as HTTP, FTP, or FILE.