Transcript Chapter 8

XP
Chapter 8
Browsing and
Searching the Web
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Browsing and Searching
the Web
XP
• In this Chapter, you will learn:
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What a Web page is
What a URL is
How a browser works
How to use a search engine
How to save text and graphics found on the Web
How to create your own Web page
About high-speed and wireless Internet-access
equipment
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Web Pages
• A Web page is a document that can contain text,
graphics, videos, sound clips and links to other
pages.
• Links between pages are called hypertext links
and allow you to follow an information thread.
• A computer linked to the Internet that holds a Web
page is called a Web server.
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Web Pages
• A group of related Web pages that contain
information about a specific topic (such as a
company, person, event, etc.) is called a Web site.
• Each Web site is created and maintained by one or
more people called Webmasters.
• The main page on a Web site is called a home
page.
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Web Pages
• A Web page often contains many links to other
pages.
• These links may be from a particular string of
words (called a text link) or from a picture
(graphics link).
• When you move your cursor over one of these
links, it turns into a hand-shaped link pointer.
• Clicking a link sends a copy of the new page to
your PC for you to view.
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Web Pages
A typical Web page
Text link
Video Display
Graphics link
Sound Clip
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What’s a URL?
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• Each Web server is located by a specific address
called a URL (uniform resource locator).
• URLs are constructed of several pieces:
– Most begin with http:// (Hypertext Transfer Protocol),
https:// for secure sights.
– Web server’s name – i.e. www.amazon
– The top-level domain – i.e. .com, .org, or .edu
– Using these three pieces connects you to the Web site’s
home page – http://www.amazon.com
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What’s a URL?
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• URLs are constructed of several pieces (cont):
– You can also connect directly to a specific page on the
Web site using the folder and file name
– Web pages are normally stored in HTML (Hypertext
Markup Language) format
– Path names follow the server name and are separated
from it by slashes.
– The world news site on CNN is:
http://www.CNN.com/world/
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What’s a URL?
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The format of a URL
http://www.cocacola.com/contest/rules.html
Web Protocol
Server name
including top level
domain
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Web page folder,
name and extension
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Using a Web Browser
• A Browser is software that reads Web pages and
interprets the HTML tags embedded in each page
so that it can be displayed on your screen.
• Two popular browsers are Microsoft Internet
Explorer and Netscape Navigator.
• Some times in order to display special files or
media, you might need to install a special plug-in.
• Browsers often store information about you and
your preferences in cookies on your PC.
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Using a Web Browser
Looking at a Web Browser
Web page
Title
URL
Back & Forward
buttons navigate
through Web pages
URL of link that is
currently being
pointed to
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Using a Search Engine
• A search engine is a giant catalog similar to the
one at your library that allows you to locate
information on Web pages.
• Search engines work with key words or phrases
• Most can handle both simple and combination
searches.
• Google and Yahoo are two common search
engines.
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Using a Search Engine
The Yahoo search engine
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Saving Text and Graphics
from the Web
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• You can print a Web page by using your browser’s
print button.
• You can copy text from Web pages by highlighting
it and using the copy option on the browser. You
can then paste it into any program.
• You can copy graphics from the Web by rightclicking them and using the Save Picture as
option.
• Be aware that most information is copyrighted!
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Saving Text and Graphics
from the Web
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Copying information from a web site
You can highlight
any text on a Web
page , copy it to the
clipboard, and paste
the text into a word
processor
Right clicking on a graphic
displays the save Picture As
option.
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Hardware – High-speed and
Wireless Internet-access equipment
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• There are other higher speed and wireless
alternatives to modems:
– ISDN – medium speed service using 2 telephone lines
and a modem can deliver up to 128 Kbps.
– DSL (Digital Subscriber Line Service) – special
telephone line delivers 1 to 4 Mbps.
– T-1 service – dedicated high speed line for commercial
use, but too expensive for home use.
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Hardware – High-speed and
Wireless Internet-access equipment
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Comparison of different Internet connections
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Hardware – High-speed and
Wireless Internet-access equipment
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• There are other higher speed and wireless
alternatives to modems (cont):
– Direct satellite service – uses satellite disk to receive
transmissions. Receives data only, telephone line used
to send data.
– Cable modem – cabled back to cable TV company.
Currently fastest Internet option for individual PCs.
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Hardware – High-speed and
Wireless Internet-access equipment
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A satellite connection
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Hardware – High-speed and
Wireless Internet-access equipment
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A cable modem setup
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Hardware – High-speed and
Wireless Internet-access equipment
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• There are other higher speed and wireless
alternatives to modems (cont):
– Voice/data cellular phones – uses hand held cellular
phones. Have limited capabilities with tiny screens
and small keyboard.
– Cellular modem – can connect any PC or laptop to your
cellular phone with a cellular modem.
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Creating your own Web Pages
Using Word to create a Web Page
You can create a
web page in Word
and then save it as
an HTML
Document
You can add
graphics
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You can create links
to other Web pages
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What do you think?
The Filtering Controversy
1.
If you had children, would you use filtering software
on your home PC to block access to certain Web sites?
2.
Do you think schools and public libraries that provide
Internet access to children should use filtering
software?
3.
Do you believe that in some situations it is appropriate
to use filtering software on computers accessed only
by adults?
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Chapter Summary
• You should now be able to:
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Understand how to locate Web sites.
Understand what the parts of a Web Page URL mean.
Work with a Web browser
Use a search engine
Save and print text and graphics from a Web page
Identify and select high speed or wireless Internetaccess equipment
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