4.07.2009

World Wide Web

"The World Wide Web," "WWW" and "Web surfing" redirects here. For the Web browser, see WorldWideWeb. For other uses, see Web and WWW (disambiguation).

WWW's historic logo designed by Robert Cailliau
The World Wide Web (commonly abbreviated as "the Web") is a very large set of interlinked hypertext documents accessed via the Internet. With a Web browser, one can view Web pages that may contain text, images, videos, and other multimedia and navigate between them using hyperlinks. Using concepts from earlier hypertext systems, the World Wide Web was started in 1989 by the English physicist Sir Tim Berners-Lee, now the Director of the World Wide Web Consortium, and later by Robert Cailliau, a Belgian computer scientist, while both were working at CERN in Geneva, Switzerland. In 1990, they proposed building a "web of nodes" storing "hypertext pages" viewed by "browsers" on a network,[1] and released that web in 1992. Connected by the existing Internet, other websites were created, around the world, adding international standards for domain names & the HTML language. Since then, Berners-Lee has played an active role in guiding the development of Web standards (such as the markup languages in which Web pages are composed), and in recent years has advocated his vision of a Semantic Web.
The World Wide Web enabled the spread of information over the Internet through an easy-to-use and flexible format. It thus played an important role in popularizing use of the Internet.[2] Although the two terms are sometimes conflated in popular use, World Wide Web is not synonymous with Internet.[3] The Internet consists of a worldwide collection of computers and sub-networks exchanging data using wires, cables, and radio links, whereas the World Wide Web is a huge set of documents, images, and other 'resources' linked by an abstract 'web' of hypertext links and URLs.
How it works
The terms Internet and World Wide Web are often used in every-day speech without much distinction. However, the Internet and the World Wide Web are not one and the same. The Internet is a global data communications system. It is a hardware and software infrastructure that provides connectivity between computers. In contrast, the Web is one of the services communicated via the Internet. It is a collection of interconnected documents and other resources, linked by hyperlinks and URLs.
Viewing a Web page on the World Wide Web normally begins either by typing the URL of the page into a Web browser, or by following a hyperlink to that page or resource. The Web browser then initiates a series of communication messages, behind the scenes, in order to fetch and display it.

4.06.2009

Website

A website is a site(location) contains a collection of pages on the world wide web.Each web site contains a home page, which is the first document users see when they enter site.
Home page , as the name suggest, is the main or opening page of a website.You will notice that several websites use the word "home" or an image of a house to guide sufers back to the main page.

The URL or Uniform Resources Locator is the specific address of a webpage, like http://geocities.com/toe6000/www1.html.
The site might also contain additional documents and files.Each site is owned and managed by an individual, company or organization.

Web page is document written in HTML code that contains text and links to other pages, files, or part of the document.The earliest Web pages were all-text document and at present there are still text-based browsers like Lynx. Although Tim Berners-Lee also wrote the first multimedia browser in 1990, graphical user-interface (GUI), browsers didn't become popular until Mosaic came along in 1993.

Searh Engine
search engine is a program that searches documents for specified keyword and returns a list of the documents where the keyword were found. Although search engine is really a general class of programs, the term is often used to specifically describe systems like google, Alta Vista and Excite that enable users to search for documents on the world wide web and USENET newsgroups.

In a simpler way, a Web Search Engine is a tool designed to search for information on the world wide web. Information may consist of web pages,images, information, and other types of files. Search engines operate algorithmically or are a mixture of algorithmic and human input.