Browsers and Communications
Want to communicate with a friend across town, in another province, or even in another country? The Internet and the WEB are the 21st-Century information resources designed for all of us to use.
Browsers are programs that provide access to Web resources. This software connects you to remote computers, opens and transfers files, displays text and images, and provides in one tool an uncomplicated interface to the Internet and Web documents. Two well-known browsers are Netscape Navigator and Microsoft Internet Explorer. For browsers to connect to other resources, the location or address of the resources must be specified. These addresses are called Uniform Resources Locators (URLs). Following the Domain Name System (DNS), all URLs have at least three basic parts. The first part presents the protocol used to connect to the resource. The protocol http:// is by far the most common. The second part presents the domain name or the name of the server where the resource is located. The server is identified as www.aol.com. (Many URLs have additional parts specifying directory paths, file names, and pointers.) The last part of the domain name following the dot (.) is the domain code. It identifies the type of organization. For example, com indicated a commercial site.
The URL http://www.aol.com connects your computer to a computer that provides information about America Online (AOL). These informational locations on the Web are called Web sites. Moving from one Web site to another is called surfing. Once the browser has connected to a Web site, a document file is sent to your computer. This document contains Hypertext Markup Language (HTML) commands. The browser interprets the HTML commands and displays the document as a Web page. Typically, the first page of a Web site is referred to as its home page.The home page presents information about the site along with references and hyperlinks, or connections to other documents that contain related information such as text files, graphic images, audio, and video clips.
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