Transcript Internet

The Internet and World
Wide Web
Robert T. Grauer
[email protected]
www.bus.miami.edu/~rgrauer
Overview
• The Internet and World Wide Web
– Origin and Terminology
– Components of a URL
– Search engines
• E-Commerce
– Security and privacy
• Introduction to HTML
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The Internet
• A network of networks
• Began in 1969 as ARPAnet (Advanced
Research Projects Agency)
• No central authority and thus impossible to
state the precise size
• The Internet is not free just because you may
not pay for it
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Internet Services
• E-mail
[email protected]
Host Computer
User name
Every address is unique!
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The World Wide Web
• A subset of the Internet consisting of all
computers with hypertext or hypermedia
documents
• These documents contain references (links)
to other documents which may be on a
different computer anywhere in the world
• Began in 1991 at the European Particle
Physics Laboratory (CERN) in Switzerland
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A Client/Server Model
• A server (Web server or Web site) is any computer
that stores then downloads hypermedia documents
• A client (a PC or a Mac) is any computer that
requests then displays hypermedia documents
• Every client must be able to display every document
from every server and does so through a browser
(e.g., Netscape or Internet Explorer)
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Acronyms Abound
• HTTP - HyperText Transfer Protocol is used to transmit
hypermedia documents
• HTTPS - A secure protocol for confidential transactions
(e.g., credit cards)
• HTML - HyperText Markup Language is the language used
to write hypermedia documents
• TCP/IP - Transmission Control Protocol/ Internet Protocol governs the flow of data across the Internet
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The URL not the Browser . . .
URL address
Hyperlink
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A Series of Hyperlinks . . .
URL address changes
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About the URL
• The URL of major sites often has the format:
www.company.com
• Examples:
www.microsoft.com
www.netscape.com
www.nba.com
www.lycos.com
• Break the URL into its components
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URL (Uniform Resource Locator)
http://www.bus.miami.edu/~rgrauer/120Syl.html
Document
Directory
Web server
Protocol (e.g., http or ftp)
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Document Not Found
http://www.bus.miami.edu/~rgrauer/120sy.html
Invalid Document
Directory
Web server
Protocol (e.g., http or ftp)
Solution - Try backing up one level at a time
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Add to (Favorites) Bookmarks
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Saving Bookmarks
• First you have to open the bookmarks. To
open the bookmarks select the bookmark
icon and choose to Edit bookmarks.
• Once the bookmark file is Open, then select
File/Save As...
• Be sure to save it as bookmark.htm
• Save this file as you would any other file. You
have the choice of saving to a diskette or to
your hard drive.
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Importing Your Bookmark.
• If you happen to lose your bookmark file you can
simply import the copy you saved. To do so:
Open your bookmarks:
• Once the bookmark file is Open, then select
File/Import
• It will then prompt you to locate the saved fileBe
sure to save it as bookmark.htm
• Save this file as you would any other file. You
have the choice of saving to a diskette or to your
hard drive.
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Remember to Refresh
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Searching Versus Browsing
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Back up in the URL
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Use a Different Engine
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Advanced Search Techniques
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Summary of Search Techniques
• Use Multiple Engines
• Use logical operators - AND, OR, and NOT;
use Help facility
• Search on a concept; e.g., “first ladies” for
“Eleanor Roosevelt”
• Explore the URL
• Set bookmarks (favorites)
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Searching
• There is an excellent tutorial on searching
the internet at
http://www.lib.berkeley.edu/TeachingLib/Guid
es/Internet/FindInfo.html.
• At the UNB Saint John Ward Chipman Library
at:
http://www.unbsj.ca/library/research/index.htm
you will find an excellent starting point for
electronic research.
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E-commerce Entails . . .
• The exchange of goods and services
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Buyer and seller
Products and suppliers
A place to “meet”
Marketing to attract the buyer
Accept and process the order
• All of these elements are present in ecommerce and traditional commerce
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What’s Different
• For the Seller
– Open 24/7
– Shoppers from anywhere
– Virtual inventory is cheaper
and extensive
– Lower transaction costs
– Target your customers
– Build an order over time
• For the Buyer
– Open 24/7
– Never leave home
– Easy to view and explore
product line
– Comparison shop
– Web site knows you
– Build an order over time
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Security and Privacy
• Depends on secure transactions
– Https protocol
– Encryption
• Privacy
– Cookie is a small file written to your disk each
time you visit a site
– Problem is when one site can read many cookies;
e.g. Double Click.com
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E- Commerce Models
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Advertising (USA Today)
Level Playing Field (Amazon & CDNow)
Selling Free Information (Found Money)
Make the Customer Pay(Fed Ex)
Improved Ordering (Dell)
Disseminate Client Data (Prudential)
Download Programs and Updates
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Advertising - www.usatoday.com
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Free Info - www.foundmoney.com
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Customer Pays - www.fedex.com
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Improved order - www.dell.com
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Client Information (client.prusec.com)
https (secure protocol)
Icon changes - security lock
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Download Programs & Updates
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In Class Assignment
• Go to the Dell website and design a system
for youself that will be used for the next three
years. No printer or Applications software is
included in this. Taxes are extra. You would
prefer a three year warranty.
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Resources
• http://help.unc.edu/documentation/pdf/iig01.pdf
• http://help.unc.edu/documentation/pdf/iis05.pdf
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