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A major service on the Internet. To understand exactly how the Web relates to the Internet, see Web vs. Internet. The World Wide Web is made up of "Web servers" that store and disseminate "Web pages," which are "rich" documents that contain text, graphics, animations and videos to anyone with an Internet connection.
The heart of the Web technology is the hyperlink, which connects each document to each other by its "URL" address, whether locally or in another country. "Click here" caused the Web to explode in the mid-1990s, turning the Internet into the largest shopping mall and information source in the world. It also enabled the concept of a "global server" that provides a source for all applications and data (see Web 2.0).
The Browser
Web pages are accessed by the user via a Web browser application such as Internet Explorer, Netscape, Safari, Opera and Firefox. The browser renders the pages on screen, executes embedded scripts and automatically invokes additional software as needed. For example, animations and special effects are provided by browser plug-ins, and audio and video are played by media player software that either comes with the operating system or from a third party.
HTML Is the Format
A Web page is a text document embedded with HTML tags that define how the text is rendered on screen. Web pages can be created with any text editor or word processor. They are also created in HTML authoring programs that provide a graphical interface for designing the layout. Authoring programs generate the HTML tags behind the scenes, but the tags can be edited if required. Many applications export documents directly to HTML, thus basic Web pages can be created in numerous ways without HTML coding. The ease of page creation helped fuel the Web's growth.
A collection of Web pages makes up a Web site. Very large organizations deploy their Web sites on inhouse servers or on their own servers co-located in a third party facility that provides power and Internet access. Small to medium sites are generally hosted by Internet service providers (ISPs). Millions of people have developed their own mini Web sites as ISPs typically host a small number of personal Web pages at no extra cost to individual customers.
The Intranet
The public Web spawned the private "intranet," an inhouse Web site for employees. Protected via a firewall that lets employees access the Internet, the firewall restricts uninvited users from coming in and viewing internal information. There is no difference in intranet and Web architectures. It has only to do with who has access.
HTTP Can Deliver Anything
HTML pages are transmitted to the user via the HTTP protocol. A Web server stores HTML pages for a Web site, but it can also be a storehouse for any kind of file delivered to a client application via HTTP. For example, the Windows version of this Encyclopedia is available as an HTTP application. The text and images are hosted on The Computer Language Company's Web server and delivered to the Windows client in the user's PC. The Windows client is an HTTP-enabled version of the popular interface first introduced in 1996 for stand-alone PCs and client/server LANs.
Where It Came From – Where It's Going
The World Wide Web was developed at the European Organization for Nuclear Research (CERN) in Geneva from a proposal by Tim Berners-Lee in 1989. It was created to share research information on nuclear physics. In 1991, the first command line browser was introduced. By the start of 1993, there were 50 Web servers, and the Voila X Window browser provided the first graphical capability. In that same year, CERN introduced its Macintosh browser, and the National Center for Supercomputing Applications (NCSA) in Chicago introduced the X Window version of Mosaic. Mosaic was developed by Marc Andreessen, who later became world famous as a principal at Netscape.
By 1994, there were approximately 500 Web sites, and, by the start of 1995, nearly 10,000. By the turn of the century, there were more than 30 million registered domain names. Many believe the Web signified the real beginning of the information age. However, those people who still use analog dial-up modems consider it the "World Wide Wait."
Everyone has some interest in the Web. ISPs, cable and telephone companies want to give you connectivity. Webmasters want more visitors. IT managers want more security. The publishing industry wants to preserve its copyrights. Hardware and software vendors want to make every product Web accessible. Nothing in the computer/communications field ever came onto the scene with such intensity. Even with the dot-com crash of 2000/2001, the future of the Web is going to be very exciting. Stay tuned! See Internet, HTTP, HTML, World Wide Wait and Wild Wooly Web.
Internet
(Lower case "i"nternet) A large network made up of a number of smaller networks.
(Upper case "I"nternet) The largest network in the world. It is made up of more than 350 million computers in more than 100 countries covering commercial, academic and government endeavors. Originally developed for the U.S. Military, the Internet became widely used for academic and commercial research. Users had access to unpublished data and journals on a variety of subjects. Today, the "Net" has become commercialized into a worldwide information highway, providing data and commentary on every subject and product on earth.
E-Mail Was the Beginning
The Internet's surge in growth in the mid-1990s was dramatic, increasing a hundredfold in 1995 and 1996 alone. There were two reasons. Up until then, the major online services (AOL, CompuServe, etc.) provided e-mail, but only to customers of the same service. As they began to connect to the Internet for e-mail exchange, the Internet took on the role of a global switching center. An AOL member could finally send mail to a CompuServe member, and so on. The Internet glued the world together for electronic mail, and today, SMTP, the Internet mail protocol, is the global e-mail standard.
The Web Was the Explosion
Secondly, with the advent of graphics-based Web browsers such as Mosaic and Netscape Navigator, and soon after, Microsoft's Internet Explorer, the World Wide Web took off. The Web became easily available to users with PCs and Macs rather than only scientists and hackers at Unix workstations. Delphi was the first proprietary online service to offer Web access, and all the rest followed. At the same time, new Internet service providers (ISPs) rose out of the woodwork to offer access to individuals and companies. As a result, the Web grew exponentially, providing an information exchange of unprecedented proportion. The Web has also become "the" storehouse for drivers, updates and demos that are downloaded via the browser as well as a global transport for delivering information by subscription, both free and paid.
Newsgroups
Although daily news and information is now available on countless Web sites, long before the Web, information on a myriad of subjects was exchanged via Usenet (User Network) newsgroups. Still thriving, newsgroup articles can be selected and read directly from your Web browser. See Usenet.
Chat Rooms
Chat rooms provide another popular Internet service. Internet Relay Chat (IRC) offers multiuser text conferencing on diverse topics. Dozens of IRC servers provide hundreds of channels that anyone can log onto and participate in via the keyboard. See IRC.
The Original Internet
The Internet started in 1969 as the ARPAnet. Funded by the U.S. Government, the ARPAnet became a series of high-speed links between major supercomputer sites and educational and research institutions worldwide, although mostly in the U.S. A major part of its backbone was the National Science Foundation's NFSNet. Along the way, it became known as the "Internet" or simply "the Net." By the 1990s, so many networks had become part of it and so much traffic was not educational or pure research that it became obvious that the Internet was on its way to becoming a commercial venture.
It Went Commercial in 1995
In 1995, the Internet was turned over to large commercial Internet providers (ISPs), such as MCI, Sprint and UUNET, which took responsibility for the backbones and have increasingly enhanced their capacities ever since. Regional ISPs link into these backbones to provide lines for their subscribers, and smaller ISPs hook either directly into the national backbones or into the regional ISPs.
The TCP/IP Protocol
Internet computers use the TCP/IP communications protocol. There are more than 100 million hosts on the Internet, a host being a mainframe or medium to high-end server that is always online via TCP/IP. The Internet is also connected to non-TCP/IP networks worldwide through gateways that convert TCP/IP into other protocols.
Life Before the Web
Before the Web and the graphics-based Web browser, the Internet was accessed from Unix terminals by academicians and scientists using command-driven Unix utilities. These utilities are still used; however, today, they reside in Windows, Mac and Linux machines as well. For example, an FTP program allows files to be uploaded and downloaded, and the Archie utility provides listings of these files. Telnet is a terminal emulation program that lets you log onto a computer on the Internet and run a program. Gopher provides hierarchical menus describing Internet files (not just file names), and Veronica lets you search Gopher sites. See FTP, Archie, Telnet, Gopher and Veronica.
The Next Internet
Ironically, some of the original academic and scientific users of the Internet have developed their own Internet once again. Internet2 is a high-speed academic research network that was started in much the same fashion as the original Internet (see Internet2). See Web vs. Internet, World Wide Web, how to search the Web, intranet, NAP, hot topics and trends, IAB, information superhighway and online service.
