03 using the internet b (re-upload)
- 1. © 2008 Prentice-Hall, Inc. 1 Technology In Action Chapter 3 Using the Internet: Making the Most of the Web’s Resources
- 2. © 2008 Prentice-Hall, Inc. 2 Topics • Internet communications • Internet multimedia • E-Commerce • Online annoyances • Web browsers • URLs • Hyperlinks
- 3. © 2008 Prentice-Hall, Inc. 3 Internet Communications • The Internet – The largest computer network in the world – A network of networks, connecting billions of computer users – It is thought that nearly 150 countries have some form of connection to the Internet – Internet Uses: • Communication – Primary usage • Shopping • Searching for information • Fun
- 4. © 2008 Prentice-Hall, Inc. 4 Internet Communications • Instant Messaging • Voice over Internet (VoIP) • Weblogs • Podcasts • Webcasts and Wikis • Chat Rooms • Newsgroups • E-mail
- 5. © 2008 Prentice-Hall, Inc. 5 Instant Messaging • Programs that enable you to communicate in real time with others who are also online • When you use IM – You set up a list of contacts • Buddy list • To communicate with someone from your buddy list, that person must be online at the same time
- 6. © 2008 Prentice-Hall, Inc. 6 Instant Messaging • When someone is trying to communicate with you when you are online – You are notified – You can then accept or reject the communication • You can also hold simultaneous individual conversations • If you all want to talk together you can create custom IM chat rooms
- 7. © 2008 Prentice-Hall, Inc. 7 Voice over Internet Protocol • VoIP – A form of voice-based Internet communication that turns a standard Internet connection into a means to place phone calls, including long distance phone calls • Uses technology similar to e-mail to send voice data digitally
- 8. © 2008 Prentice-Hall, Inc. 8 Voice over Internet Protocol • Requires – Speakers – A microphone – An Internet connection – A VoIP provider • www.skype.com – Requires that both the person placing the call and the person receiving the call have its free software installed on their computers • www.vonage.com – Lets you use your own telephone (instead of the speakers and microphone system) by connecting your phone to a special adapter that the company provides
- 9. © 2008 Prentice-Hall, Inc. 9 Voice 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 through broadband – WiFi IP phones call through Internet hotspots and wireless networks
- 10. © 2008 Prentice-Hall, Inc. 10 Weblogs (blogs) • Personal logs, or journal entries that are posted on the Web • Available to the public • Simple to create, read, and manage • Entries listed on a single page with the most recent entry at the top • Searchable • Some are personal • Many are focused on a topic
- 11. © 2008 Prentice-Hall, Inc. 11 Podcasts • Video blog (vlog) • A clip of audio or video content that is broadcast over the Internet using compressed audio files such as MP3s – Radio shows – Audio books and magazines – Educational programs
- 12. © 2008 Prentice-Hall, Inc. 12 Podcasts • You must subscribe to be able to access the most current version of the online content which is delivered to your computer automatically so that you can listen to the content when you want
- 13. © 2008 Prentice-Hall, Inc. 13 Podcasts • You can listen to the content on your computer by using a media player – RealPlayer – Windows Media Player • You can transfer the content from your computer to a portable device – iPod
- 14. © 2008 Prentice-Hall, Inc. 14 Podcasts • Uses RSS (Really Simple Syndication) technology – An XML-based format that allows frequent updates of content on the World Wide Web – Requires “aggregator” software to gather podcasts • Software programs that go out and grab the latest update of Web material according to your specifications
- 15. © 2008 Prentice-Hall, Inc. 15 Podcasts • Can be found all over the Web – Most newspapers, TV news, and radio sites offer podcasts of their programming – Some popular TV shows are available via Podcasts – Some web sites allow you to download entire books so that they can be listened to anywhere
- 16. © 2008 Prentice-Hall, Inc. 16 Podcasts • Education – Many schools are beginning to recognize this format as a means to supply students with course content updates – Instructors are creating podcasts of their lectures
- 17. © 2008 Prentice-Hall, Inc. 17 Webcasts • Webcasts – Broadcast of audio/visual content over the Internet – Not updated automatically • The most current content must be located manually by the user and then downloaded – Use streaming media technology to facilitate the viewing and downloading process of large audio and video files.
- 18. © 2008 Prentice-Hall, Inc. 18 Webcasts • Webcasts – Can include noninteractive content • A simulcast of a radio or TV broadcast – Recently webcasts have initiated interactive responses from the viewing or listening audience – Also used in the corporate world to broadcast annual meetings and in the educational arena to transmit seminars
- 19. © 2008 Prentice-Hall, Inc. 19 Wikis • Wikis – A Web site that allows anyone to change its content by adding, removing, or editing the content • www.wikipedia.org – The content is updated continuously and kept accurate by the many expert eyes that view the content • In late 2005, Wikipedia content was measured for accuracy in its scientific content and was found to be as accurate as the Encyclopedia Britannica
- 20. © 2008 Prentice-Hall, Inc. 20 Wikis • Wikis – Provide an excellent source for collaborative writing both in and out of the classroom – Like blogs, wikis can be used to express thoughts and opinions about certain topics – Unlike blogs, wikis can be edited and therefore maintain a more “common” opinion, rather than the direct expressed opinion of the initial individual writer
- 21. © 2008 Prentice-Hall, Inc. 21 E-mail • Electronic mail • A written message that is sent and received over electronic communication systems • The message can be formatted and enhanced with graphics as well as include other files as attachments • The primary method of electronic communication because its fast and convenient and reduces the cost of postage and long-distance phone calls
- 22. © 2008 Prentice-Hall, Inc. 22 E-mail • What is needed – A computer – An Internet connection – An e-mail account
- 23. © 2008 Prentice-Hall, Inc. 23 E-mail • E-mail software – Client-based • Accessible only from the computer on which it is installed – Web-based • Accessible from any computer with Internet access • Spam – Prevention
- 24. © 2008 Prentice-Hall, Inc. 24 Chat Rooms • An area on the Web where many people come together to communicate online • The conversations occur in real time and are visible to everyone in the chat room
- 25. © 2008 Prentice-Hall, Inc. 25 Chat Rooms • Focus on specific topics or interests • Identity protection – Username – Password
- 26. © 2008 Prentice-Hall, Inc. 26 Chat Rooms Vs IM • When you use IM services, you have private conversations with people you know • With Chat Rooms, anyone who enters the chat room can take part in the conversation
- 27. © 2008 Prentice-Hall, Inc. 27 Chat 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 with the intent to disrupt the chat
- 28. © 2008 Prentice-Hall, Inc. 28 Newsgroups • Online discussion forums in which people create threads, or conversations • In a thread, a newsgroup member will post messages and read and reply to messages from other members of the newsgroup
- 29. © 2008 Prentice-Hall, Inc. 29 Newsgroups • Newsgroup directory – www.tile.net/news
- 30. © 2008 Prentice-Hall, Inc. 30 LISTSERVS • Electronic mailing lists of e-mail addresses of people who are interested in a certain topic or area of interest • Listservs have been replaced to some extent by newsgroups
- 31. © 2008 Prentice-Hall, Inc. 31 Social Networking • Social networking sites like MySpace.com • 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. 32 Web Entertainment • Multimedia: – Involves forms of media and text • Graphics • Audio • Video – Streaming audio and video – Plug-in
- 33. © 2008 Prentice-Hall, Inc. 33 Web Entertainment • Streaming Audio and Video – Continuously feeds an audio file and a video file to your browser so you avoid having to wait for the entire file to download completely before listening to it or viewing it
- 34. © 2008 Prentice-Hall, Inc. 34 Web Entertainment • Plug-In – To view and hear some multimedia files on the Web, you a need special software program called a plug-in • Page 104 – For plug-ins you don’t have, the Web Site requiring the plug-in usually displays a message on the screen that includes links to a site where you can download the plug-in free of charge
- 35. © 2008 Prentice-Hall, Inc. 35 Web Entertainment • Plug-In – Most plug-ins and players will alert you to check for and download upgrades when they are available
- 36. © 2008 Prentice-Hall, Inc. 36 Web Entertainment • Plug-In – When a browser requires a plug-in to display particular web content, it usually automatically accesses the plug-in, generally without asking you for consent to start the plug-in – This automatic access can present security risks – To minimize such risks, update your plug-ins and browser software frequently so that you will have the most up-to-date remedies against identified security flaws
- 37. © 2008 Prentice-Hall, Inc. 37 Web Entertainment • Loading Multimedia Files Faster – Your browser keeps track of the Web Sites you’ve visited so that it can load them faster the next time you visit them – This cache can make your Internet surfing more efficient, but it can also congest your hard drive – To keep your system running efficiently, delete your temporary internet cache periodically