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
scsite.com/ic8/weblink and
then click World Wide Web.
protocol
domain name
path
Web page name
http://www.nps.gov/grsm/planyourvist/wildlifeviewing.htm
Address bar
Web page that is
displayed after Web
address is entered
Figure 40 After entering http://www.nps.gov/grsm/planyourvisit/wildlifeviewing.htm
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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