Microsoft Office Tutorials and References
In Depth Information
The World Wide Web
A national ISP is a business that provides Internet access in cities and towns nationwide. National
ISPs usually offer more services and have a larger technical support staff than regional ISPs.
Examples of national ISPs are AT&T and EarthLink. In addition to providing Internet access, an
online service provider ( OSP ) also has many members-only features such as instant messaging or
their own customized version of a Web browser. The two more popular OSPs are AOL (America
Online) and MSN (Microsoft Network).
A wireless Internet service provider , sometimes called a wireless data provider, is a company
that provides wireless Internet access to computers and mobile devices, such as smart phones and
portable media players, with built-in wireless capability (such as Wi-Fi) or to computers using wire-
less modems or wireless access devices. Wireless modems usually are in the form of a USB flash
drive or a card that inserts in a slot in a computer or mobile device. Examples of wireless Internet
service providers include AT&T, Sprint Broadband Direct, T-Mobile, and Verizon Wireless.
The World Wide Web
One of the more popular services on the Internet is the World Wide Web , also called the
Web , which contains billions of documents called Web pages. A Web page can contain text, graph-
ics, animation, audio, and video, and has built-in connections, or links, to other documents, graph-
ics, or other Web pages. Web pages are stored on computers throughout the world. A Web site is a
collection of related Web pages. Visitors to a Web site access and view Web pages using a program
called a Web browser . A Web page has a unique address, called a Web address or URL ( Uniform
Resource Locator ).
As shown in Figure 40, a Web address consists of a protocol, a domain name, sometimes the path
to a specific Web page or location in a
Web page, and the Web page name. Many
Web page addresses begin with http:// ,
which stands for Hypertext Transfer
Protocol , the set of rules that defines
how pages transfer on the Internet.
The domain name identifies the Web
site, which is stored on a Web server.
A Web server is a computer that delivers
requested Web pages to your computer.
The term Web 2.0 refers to Web sites
that provide a means for users to share
personal information (such as social
networking Web sites), allow users to
modify the Web site contents (such as
some blogs), and/or have software built
into the site for users to access (such as
Web applications). A social networking
Web site or online social network is an
online community that encourages mem-
bers to share their interests, ideas, stories,
photos, music, and videos with other reg-
istered users. A blog is an informal Web
site consisting of time-stamped articles
in a diary or journal format. Examples
of software available as Web applications
include those that allow you to send and
receive e-mail messages, prepare your
taxes, organize digital photos, create
documents, and play games.
World Wide Web
For more information, visit and
then click World Wide Web.
domain name
Web page name
Address bar
Web page that is
displayed after Web
address is entered
Figure 40 After entering
as the Web address in the Address bar, this Web page at the United States National
Park Service Web site is displayed.
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