Microsoft Office Tutorials and References
In Depth Information
COM 21
NETWORKS AND THE INTERNET
The Internet
The world’s largest network is the Internet , which is a worldwide collection of networks that
connects millions of businesses, government agencies, educational institutions, and individuals.
With an abundance of resources and data accessible via the Internet, more than 1 billion people
around the world use the Internet for a variety of reasons, including the following:
Communicating with and meeting other people
• Accessing a wealth of information, news, and research findings
Shopping for goods and services
• Banking and investing
Accessing sources of entertainment and leisure, such as online games, music, videos, books
and magazines
Most users connect to the Internet through a regional or national ISP, an online service
provider, or a wireless Internet service provider. An ISP Internet service provider ) is an (
zation, such as a cable company or telephone company, that supplies connections to the Internet
for a monthly fee. Earthlink and AT&T Worldnet are examples of national ISPs. Like an ISP, an
online service provider OSP ) provides access to the Internet, but it also provides a variety of (
other specialized content and services such as news, weather, financial data, e-mail, games, and
more. Two popular online services are America Online (AOL) and The Microsoft Network (MSN).
A wireless Internet service provider (WISP) is a company that provides wireless Internet access
to computers and mobile devices such as smart phones and PDAs. Boingo Wireless and Cingular
Wireless are examples of WISPs.
WEB LINK
World Wide
Web
For more information,
visit scsite.com/ic7/
weblink and then click
World Wide Web.
The World Wide Web
One of the more popular segments of 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, graphics,
audio, and video, and has built-in connections, or
links, to other Web documents. Figure 35 on the
next page shows different types of Web pages
found on the World Wide Web today. Web pages
are stored on computers throughout the world. A
Web site is a related collection of Web pages.
Visitors to a Web site access and view Web pages
using a software program called a Web browser .A
Web page has a unique address, called a Uniform
Resource Locator URL ).
FIGURE 34 A wide area network (WAN) can be quite large and
complex, connecting users in district offices around the world.
communications
satellite
cellular
connection
main
office
server
telephone
network
ISP
Internet
branch
office
branch
office
telecommuting
employee
branch
office
mobile
employee
international
office
Search JabSto ::




Custom Search