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03 using the internet b (re-upload)


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  • 1. © 2008 Prentice-Hall, Inc.1Technology In ActionChapter 3Using the Internet:Making the Most of the Web’s Resources
  • 2. © 2008 Prentice-Hall, Inc.2Topics• Internet communications• Internet multimedia• E-Commerce• Online annoyances• Web browsers• URLs• Hyperlinks
  • 3. © 2008 Prentice-Hall, Inc.3Internet Communications• The Internet– The largest computer network in the world– A network of networks, connecting billions of computerusers– It is thought that nearly 150 countries have some formof connection to the Internet– Internet Uses:• Communication – Primary usage• Shopping• Searching for information• Fun
  • 4. © 2008 Prentice-Hall, Inc.4Internet Communications• Instant Messaging• Voice over Internet (VoIP)• Weblogs• Podcasts• Webcasts and Wikis• Chat Rooms• Newsgroups• E-mail
  • 5. © 2008 Prentice-Hall, Inc.5Instant Messaging• Programs that enable you tocommunicate in real time withothers who are also online• When you use IM– You set up a list of contacts• Buddy list• To communicate withsomeone from your buddylist, that person must beonline at the same time
  • 6. © 2008 Prentice-Hall, Inc.6Instant Messaging• When someone is trying to communicatewith you when you are online– You are notified– You can then accept orreject the communication• You can also holdsimultaneous individualconversations• If you all want to talktogether you can create custom IM chatrooms
  • 7. © 2008 Prentice-Hall, Inc.7Voice over Internet Protocol• VoIP – A form of voice-based Internetcommunication that turns a standardInternet connection into a means to placephone calls, including long distance phonecalls• Uses technology similar to e-mail to sendvoice data digitally
  • 8. © 2008 Prentice-Hall, Inc.8Voice over Internet Protocol• Requires– Speakers– A microphone– An Internet connection– A VoIP provider•– Requires that both the person placing the call and the person receivingthe call have its free software installed on their computers•– Lets you use your own telephone (instead of the speakers andmicrophone system) by connecting your phone to a special adapter thatthe company provides
  • 9. © 2008 Prentice-Hall, Inc.9Voice over Internet Protocol• Services differ– Free services require an account on both ends– Paid services connect phone to computer– Cable and DSL providers offer phone throughbroadband– WiFi IP phones call through Internet hotspots andwireless networks
  • 10. © 2008 Prentice-Hall, Inc.10Weblogs (blogs)• Personal logs, orjournal entries thatare posted on theWeb• Available to thepublic• Simple to create,read, and manage• Entries listed on asingle page with themost recent entry atthe top• Searchable• Some are personal• Many are focused on atopic
  • 11. © 2008 Prentice-Hall, Inc.11Podcasts• Video blog (vlog)• A clip of audio or video content that isbroadcast over the Internet usingcompressed audio files such as MP3s– Radio shows– Audio books and magazines– Educational programs
  • 12. © 2008 Prentice-Hall, Inc.12Podcasts• You must subscribe to be able to accessthe most current version of the onlinecontent which is delivered to yourcomputer automatically so that you canlisten to the content when you want
  • 13. © 2008 Prentice-Hall, Inc.13Podcasts• You can listen to the content on yourcomputer by using a media player– RealPlayer– Windows Media Player• You can transfer the content from yourcomputer to a portable device– iPod
  • 14. © 2008 Prentice-Hall, Inc.14Podcasts• Uses RSS (Really Simple Syndication)technology– An XML-based format that allows frequent updates ofcontent on the World Wide Web– Requires “aggregator” software to gather podcasts• Software programs that go out and grab the latest update ofWeb material according to your specifications
  • 15. © 2008 Prentice-Hall, Inc.15Podcasts• Can be found all over the Web– Most newspapers, TV news, and radio sitesoffer podcasts of their programming– Some popular TV shows are available viaPodcasts– Some web sites allow you to download entirebooks so that they can be listened toanywhere
  • 16. © 2008 Prentice-Hall, Inc.16Podcasts• Education– Many schools are beginning to recognize thisformat as a means to supply students withcourse content updates– Instructors are creating podcasts of theirlectures
  • 17. © 2008 Prentice-Hall, Inc.17Webcasts• Webcasts– Broadcast of audio/visual content over theInternet– Not updated automatically• The most current content must be locatedmanually by the user and then downloaded– Use streaming media technology to facilitatethe viewing and downloading process of largeaudio and video files.
  • 18. © 2008 Prentice-Hall, Inc.18Webcasts• Webcasts– Can include noninteractive content• A simulcast of a radio or TV broadcast– Recently webcasts have initiatedinteractive responses from the viewing orlistening audience– Also used in the corporate world tobroadcast annual meetings and in theeducational arena to transmit seminars
  • 19. © 2008 Prentice-Hall, Inc.19Wikis• Wikis– A Web site that allows anyone to change itscontent by adding, removing, or editing thecontent•– The content is updated continuously and keptaccurate by the many expert eyes that viewthe content• In late 2005, Wikipedia content was measured foraccuracy in its scientific content and was found tobe as accurate as the Encyclopedia Britannica
  • 20. © 2008 Prentice-Hall, Inc.20Wikis• Wikis– Provide an excellent source for collaborativewriting both in and out of the classroom– Like blogs, wikis can be used to expressthoughts and opinions about certain topics– Unlike blogs, wikis can be edited andtherefore maintain a more “common” opinion,rather than the direct expressed opinion of theinitial individual writer
  • 21. © 2008 Prentice-Hall, Inc.21E-mail• Electronic mail• A written messagethat is sent andreceived overelectroniccommunicationsystems• The message can beformatted andenhanced withgraphics as well as include other files as attachments• The primary method of electronic communication becauseits fast and convenient and reduces the cost of postageand long-distance phone calls
  • 22. © 2008 Prentice-Hall, Inc.22E-mail• What is needed– A computer– An Internetconnection– An e-mail account
  • 23. © 2008 Prentice-Hall, Inc.23E-mail• E-mail software– Client-based• Accessible onlyfrom thecomputer onwhich it isinstalled– Web-based• Accessiblefrom anycomputer withInternet access• Spam– Prevention
  • 24. © 2008 Prentice-Hall, Inc.24Chat Rooms• An area on the Web where many people cometogether to communicate online• The conversations occur in real time and arevisible to everyone in the chat room
  • 25. © 2008 Prentice-Hall, Inc.25Chat Rooms• Focus on specific topics or interests• Identity protection– Username– Password
  • 26. © 2008 Prentice-Hall, Inc.26Chat Rooms Vs IM• When you use IM services, you have privateconversations with people you know• With Chat Rooms, anyone who enters the chatroom can take part in the conversation
  • 27. © 2008 Prentice-Hall, Inc.27Chat Rooms• General rules of etiquette (Netiquette)– Obvious standards of behavior• Introducing yourself when you enter a chat room• Specifically address the person you are talking to– Users are also expected to refrain from• Swearing• Name calling• Using explicit or prejudiced language• Harassing other participants• Users cannot post the same text repeatedly withthe intent to disrupt the chat
  • 28. © 2008 Prentice-Hall, Inc.28Newsgroups• Online discussion forums in which peoplecreate threads, or conversations• In a thread, anewsgroup memberwill post messagesand read and reply tomessages from othermembers of thenewsgroup
  • 29. © 2008 Prentice-Hall, Inc.29Newsgroups• Newsgroup directory–
  • 30. © 2008 Prentice-Hall, Inc.30LISTSERVS• Electronic mailing lists of e-mail addressesof people who are interested in a certaintopic or area of interest• Listservs have been replaced to someextent by newsgroups
  • 31. © 2008 Prentice-Hall, Inc.31Social Networking• Social networking sites like• Members share common interests• Members communicate by voice, chat,instant message, video, and blogs• Members create personalized profiles• Growth has been explosive• Risks must be recognized and reduced
  • 32. © 2008 Prentice-Hall, Inc.32Web Entertainment• Multimedia:– Involves forms of mediaand text• Graphics• Audio• Video– Streaming audio andvideo– Plug-in
  • 33. © 2008 Prentice-Hall, Inc.33Web Entertainment• Streaming Audio and Video– Continuously feeds anaudio file and a videofile to your browser soyou avoid having towait for the entire file todownload completely beforelistening to it or viewing it
  • 34. © 2008 Prentice-Hall, Inc.34Web Entertainment• Plug-In– To view and hear some multimedia files on theWeb, you a need special software programcalled a plug-in• Page 104– For plug-ins you don’t have, the Web Siterequiring the plug-in usually displays a messageon the screen that includes links to a site whereyou can download the plug-in free of charge
  • 35. © 2008 Prentice-Hall, Inc.35Web Entertainment• Plug-In– Most plug-ins and players will alert you to checkfor and download upgrades when they areavailable
  • 36. © 2008 Prentice-Hall, Inc.36Web Entertainment• Plug-In– When a browser requires a plug-in to displayparticular web content, it usually automaticallyaccesses the plug-in, generally without askingyou for consent to start the plug-in– This automatic access can present securityrisks– To minimize such risks, update your plug-insand browser software frequently so that you willhave the most up-to-date remedies againstidentified security flaws
  • 37. © 2008 Prentice-Hall, Inc.37Web Entertainment• Loading Multimedia Files Faster– Your browser keeps track of the Web Sitesyou’ve visited so that it can load them faster thenext time you visit them– This cache can make your Internet surfing moreefficient, but it can also congest your hard drive– To keep your system running efficiently, deleteyour temporary internet cache periodically