World Wide Web

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Stands for “World Wide Web.” It is important to know that this is not a synonym for the Internet. The World Wide Web, or just “the Web,” as ordinary people call it, is a subset of the Internet. The Web consists of pages that can be accessed using a Web browser. The Internet is the actual network of networks where all the information resides. Things like Telnet, FTP, Internet gaming, Internet Relay Chat (IRC), and e-mail are all part of the Internet, but are not part of the World Wide Web. The Hyper-Text Transfer Protocol (HTTP) is the method used to transfer Web pages to your computer. With hypertext, a word or phrase can contain a link to another Web site. All Web pages are written in the hyper-text markup language (HTML), which works in conjunction with HTTP.

What is the WWW?

• WWW stands for the World Wide Web
• The World Wide Web 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?

• 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, Chrome, and 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: http://www.someone.com/page.htm

How Does the Browser Display the Pages?

• All Web pages contain instructions on how to be displayed
• The browser displays the page by reading these instructions
• The most common display instructions are called HTML tags
• The HTML tag for a paragraph looks like this: <p>
• A paragraph in HTML is defined like this: <p>This is a paragraph.</p>
  

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