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The World Wide Web

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What is the World Wide Web?

  • The World Wide Web (WWW) is most often called the Web.

  • The Web is a network of computers all over the world.

  • All the computers in the Web can communicate with each other.

  • All the computers use a communication standard called HTTP.

How does the  WWW work?

  • Web information is stored in documents called Web pages

  • Web pages are files stored on computers called Web servers.

  • Computers reading the Web pages are called Web clients.

  • Web clients view the pages with a program called a Web browser.

  • Popular browsers are Internet Explorer and Mozilla Firefox.


How does the browser fetch the pages?

  • A browser fetches a Web page from a server by a request.

  • A request is a standard HTTP request containing a page address.

  • A page address looks like this: http://www.someone.com/page.htm.


How does the browser display the pages?

  • All Web pages contain instructions for display

  • The browser displays the page by reading these instructions.

  • The most common display instructions are called HTML tags.

  • HTML tags look like this <p>This is a Paragraph</p>.


Who is making the Web standards?

  • The Web standards are not made up by Netscape or Microsoft.

  • The rule-making body of the Web is the W3C.

  • W3C stands for the World Wide Web Consortium.

  • W3C puts together specifications for Web standards.

  • The most essential Web standards are HTML, CSS and XML.

  • The latest HTML standard is XHTML 1.0.


Internet Joke

Customer: "I don't have a computer. Is the internet available in book form?"


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