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Unit G The Web and E-Commerce


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Unit G The Web and E-Commerce

  1. 1. Computer Concepts – Illustrated 8 th  edition Unit G: The Web and E-Commerce
  2. 2. Objectives <ul><li>Introduce Web technology </li></ul><ul><li>Explore Web browsers </li></ul><ul><li>Examine Other Web and Internet services </li></ul><ul><li>Examine Web page features </li></ul>Computer Concepts – Illustrated 8th Edition Computer Concepts – Illustrated 8th Edition
  3. 3. Objectives (continued) <ul><li>Use search engines </li></ul><ul><li>Introduce e-commerce </li></ul><ul><li>Secure e-commerce transactions </li></ul><ul><li>Enhance Web technology </li></ul>Computer Concepts – Illustrated 8th Edition Computer Concepts – Illustrated 8th Edition
  4. 4. Introducing Web Technology <ul><li>Internet: a communications network that transmits data </li></ul><ul><li>Web : a collection of documents called Web pages that are accessed over the Internet and are related by using links </li></ul><ul><li>Web page : a document that can contain text, graphics, video, and audio </li></ul><ul><ul><li>A Web page is an HTML document </li></ul></ul><ul><li>Web site : a collection of related Web pages </li></ul>Computer Concepts – Illustrated 8th Edition Computer Concepts – Illustrated 8th Edition
  5. 5. Introducing Web Technology (continued) <ul><li>Browser (or a Web browser ): software that displays Web page elements </li></ul><ul><li>Link (or hyperlink ): a navigation tool on a Web page </li></ul><ul><ul><li>Hypertext </li></ul></ul><ul><li>URL (Uniform Resource Locator): the address for a Web page </li></ul><ul><li>Web resource : any data file that has a URL </li></ul><ul><ul><li>HTML document, graphic, video, sound file, etc. </li></ul></ul>Computer Concepts – Illustrated 8th Edition
  6. 6. Computer Concepts – Illustrated 8th Edition Figure G-2: How Web pages get to your computer
  7. 7. Introducing Web Technology (continued) <ul><li>Web server : a computer that uses special software to transmit Web pages over the Internet </li></ul><ul><li>HTTP (Hypertext Transfer Protocol) : the communications protocol used to transport data over the Web </li></ul><ul><li>HTTP status code : indicates whether or not the browser’s request can be fulfilled </li></ul><ul><ul><li>“ 404 Not Found” message </li></ul></ul>Computer Concepts – Illustrated 8th Edition
  8. 8. Exploring Web Browsers <ul><li>Popular browsers: </li></ul><ul><ul><li>Microsoft Windows Internet Explorer (IE) </li></ul></ul><ul><ul><li>Mozilla Firefox </li></ul></ul><ul><ul><li>Google Chrome </li></ul></ul><ul><ul><li>Apple Safari (for the Mac) </li></ul></ul><ul><li>Tabs: a way to view more than one Web page within one browser window </li></ul><ul><li>Favorite (or bookmark ): a saved link to a Web site </li></ul>Computer Concepts – Illustrated 8th Edition
  9. 9. Computer Concepts – Illustrated 8th Edition Figure G-3: Popular browsers
  10. 10. Exploring Web Browsers (continued) <ul><li>Helper application </li></ul><ul><ul><li>Also called add-on , plug-in , or player </li></ul></ul><ul><ul><li>Extends a browser’s ability </li></ul></ul><ul><li>Installing browser updates is important </li></ul><ul><li>Web pages can be viewed on PDAs, smartphones, and other portable computing devices </li></ul><ul><li>Web cache : stores temporary Web files </li></ul>Computer Concepts – Illustrated 8th Edition
  11. 11. Examining Other Web and Internet Services <ul><li>FTP (file transfer protocol) : provides a way to transfer files from one computer to another over any TCP/IP network </li></ul><ul><li>Podcast (or Webcast): an audio file distributed through downloads or a feed </li></ul><ul><li>RSS : a format for feeding or syndicating content from Web sites to user’s computer </li></ul><ul><li>Social networking : use of the Web to stay connected with family, friends, colleagues </li></ul><ul><ul><li>Facebook, LinkedIn, MySpace, Bebo </li></ul></ul>Computer Concepts – Illustrated 8th Edition
  12. 12. Examining Other Web and Internet Services (continued) <ul><li>Blog : a Web site where people can provide commentary or news on a particular subject </li></ul><ul><ul><li>Can also use as personal online diaries </li></ul></ul><ul><li>Wiki : a collaborative Web site that can be accessed and edited by anyone </li></ul><ul><ul><li>Wikipedia </li></ul></ul><ul><li>Communicating in real time: instant messaging (IM) , Voice over IP </li></ul><ul><li>Web 2.0 refers to new and innovative ways of using the Web </li></ul>Computer Concepts – Illustrated 8th Edition
  13. 13. Computer Concepts – Illustrated 8th Edition Figure G-8: Wikipedia
  14. 14. Examining Web Page Features <ul><li>HTML (Hypertext Markup Language) </li></ul><ul><ul><li>A set of specifications for creating HTML documents that a browser can display as a Web page </li></ul></ul><ul><ul><li>HTML is a markup language </li></ul></ul><ul><ul><li>HTML tags specify how the document should appear when displayed </li></ul></ul><ul><ul><li>XHTML is the version after HTML 4 </li></ul></ul>Computer Concepts – Illustrated 8th Edition
  15. 15. Computer Concepts – Illustrated 8th Edition Figure G-10: A source HTML document and its Web page
  16. 16. Examining Web Page Features (continued) <ul><li>Mailto: link </li></ul><ul><ul><li>Automatically opens a preaddressed email form </li></ul></ul><ul><li>HTML tags are used to create links to other Web documents </li></ul><ul><li>Web page authoring tools </li></ul><ul><ul><li>Text editors, such as Notepad </li></ul></ul><ul><ul><li>HTML conversion utility </li></ul></ul><ul><ul><li>Web authoring software </li></ul></ul><ul><ul><li>Online Web page authoring tools </li></ul></ul>Computer Concepts – Illustrated 8th Edition
  17. 17. Using Search Engines <ul><li>Web search engine (or search engine ) </li></ul><ul><ul><li>A program designed to help people locate information on the Web </li></ul></ul><ul><ul><li>Contains four components: </li></ul></ul><ul><ul><ul><li>Web crawler : combs the Web to gather data that is representative of the Web pages </li></ul></ul></ul><ul><ul><ul><li>Indexer : makes pages easy to find based on their contents </li></ul></ul></ul><ul><ul><ul><li>Database </li></ul></ul></ul><ul><ul><ul><li>Query processor : looks for search terms in the database and displays a list of relevant Web sites in browser </li></ul></ul></ul>Computer Concepts – Illustrated 8th Edition
  18. 18. Computer Concepts – Illustrated 8th Edition Figure G-12: Search results
  19. 19. Using Search Engines (continued) <ul><li>Order of Web sites in search results </li></ul><ul><ul><li>Depends on relevancy criteria, such as: </li></ul></ul><ul><ul><ul><li>Key word matches </li></ul></ul></ul><ul><ul><ul><li>Link popularity </li></ul></ul></ul><ul><ul><li>Keyword stuffing : an unethical practice in which meta keywords are manipulated to gain high relevancy rankings </li></ul></ul><ul><li>Boolean operator (or a search operator): a word or symbol that describes a relationship between keywords </li></ul><ul><ul><li>AND, OR, NOT </li></ul></ul>Computer Concepts – Illustrated 8th Edition
  20. 20. Introducing E-Commerce <ul><li>E-commerce : financial transactions conducted over a computer network </li></ul><ul><ul><li>B2C (business-to-consumer) e-commerce </li></ul></ul><ul><ul><li>C2C (consumer-to-consumer) e-commerce </li></ul></ul><ul><ul><li>B2B (business-to-business) e-commerce </li></ul></ul><ul><ul><li>B2G (business-to-government) e-commerce </li></ul></ul>Computer Concepts – Illustrated 8th Edition
  21. 21. Computer Concepts – Illustrated 8th Edition Figure G-15: E-commerce shopping
  22. 22. Introducing E-Commerce (continued) <ul><li>Online shopping cart (or online shopping bag ): cyberspace version of a shopping cart </li></ul><ul><ul><li>Most shopping carts work by using cookies </li></ul></ul><ul><ul><ul><li>Cookie : data generated by a Web server and stored in a text file on user’s computer </li></ul></ul></ul><ul><ul><ul><li>Users can choose to allow cookies or not </li></ul></ul></ul><ul><li>Advertising on Web sites </li></ul><ul><ul><li>Banner ad </li></ul></ul><ul><ul><li>Pop-up ad </li></ul></ul><ul><ul><li>Banner and pop-up ads earn revenue based on click-through rate </li></ul></ul>Computer Concepts – Illustrated 8th Edition
  23. 23. Securing E-Commerce Transactions <ul><li>Password security used to prevent unauthorized access </li></ul><ul><li>A secure connection encrypts the data transmitted between a computer and a site </li></ul><ul><li>Technologies that create secure connections include: </li></ul><ul><ul><li>SSL (Secure Sockets Layer) </li></ul></ul><ul><ul><li>TLS (Transport Layer Security) </li></ul></ul><ul><ul><li>S-HTTP (secure HTTP) </li></ul></ul><ul><li>Encryption : science of coding data </li></ul>Computer Concepts – Illustrated 8th Edition
  24. 24. Computer Concepts – Illustrated 8th Edition Figure G-18: Identifying a secure connection
  25. 25. Securing E-Commerce Transactions (continued) <ul><li>Ways to pay for online purchases: </li></ul><ul><ul><li>Submitting credit card number directly </li></ul></ul><ul><ul><li>Using a third-party payment service, such as PayPal </li></ul></ul><ul><ul><ul><li>Person-to-person payment </li></ul></ul></ul><ul><ul><li>Electronic wallets </li></ul></ul><ul><ul><li>One-time-use credit card numbers </li></ul></ul>Computer Concepts – Illustrated 8th Edition
  26. 26. Enhancing Web Technology <ul><li>HTML script : a series of program instructions </li></ul><ul><ul><li>Allow Web pages to be interactive </li></ul></ul><ul><li>HTML form : used to collect user input for different types of Web sites </li></ul><ul><li>Scripts can run on a client or a server </li></ul><ul><ul><li>Server-side script : scripting statements that run on a server </li></ul></ul><ul><ul><li>Client-side script : scripting statements that run on user’s local computer </li></ul></ul>Computer Concepts – Illustrated 8th Edition
  27. 27. Computer Concepts – Illustrated 8th Edition Figure G-20: HTML form
  28. 28. Enhancing Web Technology (continued) <ul><li>Java applet : an application written in the Java programming language </li></ul><ul><ul><li>Java applets are fairly safe </li></ul></ul><ul><li>ActiveX control : a compiled program that can be referenced from within an HTML document, downloaded, installed, and executed </li></ul><ul><ul><li>ActiveX controls include digital certificates to increase their security </li></ul></ul>Computer Concepts – Illustrated 8th Edition
  29. 29. Talking Points: Regulating the Web <ul><li>Internet hosts a significant amount of provocative and disturbing material </li></ul><ul><ul><li>“ Netizens”: members of the online community of the Internet </li></ul></ul><ul><ul><li>Censorship advocates </li></ul></ul><ul><ul><li>Free-speech supporters </li></ul></ul><ul><ul><li>Cybercensorship </li></ul></ul><ul><ul><li>In many countries, free speech is not a basic right conferred to all citizens </li></ul></ul><ul><ul><ul><li>“ Great Firewall of China” </li></ul></ul></ul>Computer Concepts – Illustrated 8th Edition
  30. 30. Summary <ul><li>This chapter introduced: </li></ul><ul><ul><li>Technologies that bring the Web to user’s computer screen </li></ul></ul><ul><ul><li>Tools that user’s use to view and navigate Web pages </li></ul></ul><ul><ul><li>E-commerce </li></ul></ul><ul><ul><li>Technologies that enhance user’s Web experience </li></ul></ul><ul><ul><li>Issues regarding censorship on the Web </li></ul></ul>Computer Concepts – Illustrated 8th Edition