the internet and world wide web robert t. grauer [email protected] rgrauer
TRANSCRIPT
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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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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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Hyperlink
The URL not the Browser . . .
URL address
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URL address changes
A Series of Hyperlinks . . .
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About the URL• The URL of major sites often has the format:
www.company.com• Examples:
www.microsoft.comwww.netscape.comwww.nba.comwww.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
Web server
Protocol (e.g., http or ftp)
Directory
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Document Not Found
http://www.bus.miami.edu/~rgrauer/120sy.html
Invalid Document
Web server
Protocol (e.g., http or ftp)
Directory
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/Guides/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– 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 e-commerce 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
• 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)
Icon changes - security lock
https (secure protocol)
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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