Chapter02 - Discovering Computers 2009 Chapter 2 The...

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Unformatted text preview: Discovering Computers 2009 Chapter 2 The Internet and World Wide Web Chapter 2 Objectives Discuss the history of the Internet Describe the types of Web sites Explain how to access and connect to the Internet Recognize how Web pages use graphics, animation, audio, video, virtual reality, and plug-ins Identify the steps required for Web publishing Analyze an IP address Identify the components of a Web address Describe the types of e-commerce Explain the purpose of a Web browser Explain how e-mail, mailing lists, instant messaging, chat rooms, VoIP, FTP, and newsgroups and message boards work Search for information on the Web Identify the rules of netiquette Next The Internet What are some services found on the Internet? p. 68-69 Fig. 2-1 Next History of the Internet How did the Internet originate? ARPANET Networking project by Pentagon’s Advanced Research Projects Agency (ARPA) Goal: To allow scientists at different locations to share information Goal: To function if part of network were disabled Became functional September 1969 p. 69 Next History of the Internet How has the Internet grown? Today More than 500 million host nodes 1984 More than 1,000 host nodes 1969 Four host nodes p. 69 Next History of the Internet Who controls the Internet? Ø Ø No one — it is a public, cooperative, and independent network Several organizations set standards c c World Wide Web Consortium (W3C) § § § Oversees research, sets standards and guidelines Mission is to contribute to the growth of the Web Nearly 400 organizations around the world are members of the W3C Click to view Web Link, click Chapter 2, Click Web Link from left navigation, then click W3C below Chapter 2 p. 70 Next How the Internet Works How can you connect to the Internet? Slow-speed technology Dial-up access modem in your computer uses a standard telephone line to connect to the Internet Connection must be established each time you log on. High-speed connection DSL, cable modem, FTTP, fixed wireless, wireless modem, Wi-Fi, and satellite modems Connection is always on— whenever the computer is running p. 70 Next How the Internet Works What are ways to access the Internet? 1. 2. 3. ISP, Regional or National OSP (AOL and MSN, for example) Wireless Internet Service Provider Click to view Web Link, click Chapter 2, Click Web Link from left navigation, then click Modems below Chapter 2 p. 71 – 72 Fig. 2-2 Next How the Internet Works How might data travel the Internet using a cable modem connection? p. 73 Fig. 2-3 Next How the Internet Works What is a domain name? Ø Text version of Internet protocol (IP) address § Number that uniquely identifies each computer or device connected to Internet p. 73 - 74 Figs. 2-4 – 2-5 Next The World Wide Web What is the World Wide Web (WWW)? A worldwide collection of electronic documents Also called the Web Each electronic document is called a Web page Can contain text, graphics, audio, video, and built-in connections A Web site is a collection of related Web pages p. 75 Next The World Wide Web What is a Web browser? Ø Program that allows you to view Web pages Internet Explorer Firefox Netscape Opera Safari p. 75 Next The World Wide Web How does a Web browser display a home page? Step 2. Web browser looks up the home page setting Step 3. Step 1. Click the Web browser program name The Web browser communicates with the access provider’s server to retrieve the IP address. The IP address is sent to your computer. Step 4. The home page displays in the Web browser p. 75 Fig. 2-6 Next The World Wide Web What is a home page? Ø Ø The first page that a Web site displays Often provides connections to other Web pages p. 75 - 76 Fig.2-6 Next The World Wide Web How do Internet-enabled mobile devices access the Web? Ø Use a microbrowser that displays Web pages that contain mostly text p. 76 Fig. 2-7 Next The World Wide Web What is downloading? Ø Ø The process of a computer receiving information Depending upon connection speed, downloading can take from a few seconds to several minutes p. 76 Next The World Wide Web What is a URL? Unique address for a Web page A web server delivers the Web page to your computer p. 76 - 77 Fig. 2-8 Next The World Wide Web What is a hyperlink (link)? Ø Built-in connection to another related Web page location § § § Item found elsewhere on same Web page Different Web page at same Web site Web page at a different Web site p. 76 - 78 Next The World Wide Web How can you recognize links? Ø Ø Pointer changes to a small hand when you point to a link A link can be text or an image Text links are usually underlined and in a different color Ø p. 77 Fig. 2-9 Next The World Wide Web What is a search engine? Ø Program used to find Web sites and Web pages by entering words or phrases called search text § Also called a keyword p. 78 – 80 Fig. 2-10 Next The World Wide Web What is a subject directory? Ø Ø Search tool with organized set of categories and subcategories Lets you find information by clicking links rather than entering keywords p. 78 – 80 Next The World Wide Web What is a hit? Ø Any Web site name that is listed as the result of a search p. 80 Fig. 2-11 Next The World Wide Web What are the twelve basic types of Web sites? Portal News Information al Business/ Marketing Educational Entertainme nt Advocacy Blog Wiki Social Network Content Aggregator Personal p. 82 – 84 Next The World Wide Web What is a portal? Ø A Web site that offers a variety of services from one, convenient location, usually for free § Searching, news, sports and weather, Web publishing, reference tools, stock quotes, maps, shopping, e-mail, and online communities (Web sites that join people with similar interests) p. 82 – 83 Fig. 214a Next The World Wide Web What is a news Web site? Ø Ø Contains newsworthy material Stories and articles relating to current events, life, money, sports, and the weather p. 82 - 83 Fig. 214b Next The World Wide Web What is an informational Web site? Ø Ø Contains factual information Created by organizations and government agencies p. 82 – 83 Fig. 214c Next The World Wide Web What is a business/marketing Web site? Ø Ø Contains content that promotes products or services Allows you to purchase products or services online p. 82 – 83 Fig. 214d Next The World Wide Web What is an educational Web site? Ø Offers avenues for formal and informal teaching and learning § § Learn how airplanes fly or how to cook a meal Some colleges offer online classes and degrees p. 82 - 83 Fig. 214e Next The World Wide Web What is an entertainment Web site? Ø Offers an interactive and engaging environment featuring music, videos, sports, games, ongoing Web episodes, sweepstakes, chats, and more p. 82 - 83 Fig. 2-14f Next The World Wide Web What is an advocacy Web site? Ø Contains content that describes a cause, opinion, or idea p. 82 - 83 Fig. 214g Next The World Wide Web What is a blog? Short for Weblog Ø Uses a regularly updated journal format to reflect the interests, opinions, and personalities of the author and sometimes site visitors Ø Video blog (vlog), blogosphere, and vlogosphere Ø p. 82 - 83 Fig. 214h Next The World Wide Web What is a wiki? Ø Collaborative Web site that allows users to create, add to, modify, or delete the Web site content via their Web browser p. 82-84 Fig. 2-14i Next The World Wide Web What is an online social network? Ø Ø Encourages members to share their interests, ideas, stories, photos, music, and videos Media sharing Web site Click to view Web Link, click Chapter 2, Click Web Link from left navigation, then click Facebook below Chapter 2 p. 83 - 84 Fig. 2-14j Next The World Wide Web What is a content aggregator? Ø Business that gathers and organizes Web content and then distributes, or feeds, the content to subscribers for free or a fee p. 83 - 84 Fig. 214k Next The World Wide Web What is a personal Web site? Ø Ø Web page maintained by private individual or family Reasons: sharing life experience with the world or job hunting p. 83 - 84 Fig. 2-14l Next The World Wide Web What are the guidelines for evaluating the value of a Web site? Affiliation Audience Authority Content Currency Design Objectivity p. 84 Fig. 2-15 Next The World Wide Web What is multimedia? Ø Application combining text with other media elements § § § § § § Graphics Animation Audio Video Virtual reality Plug-ins p. 85, 89 Fig. 2-16 Next The World Wide Web What graphics formats are used on the Web? BMP GIF (pronounced JIFF) PNG (pronounced ping) TIFF JPEG (pronounced JAYpeg) p. 85 Fig. 2-17 Next The World Wide Web What is a thumbnail? Ø Small version of a larger graphic —used to improve Web page display time c § Usually click on thumbnail to display larger graphic p. 86 Fig. 2-18 Next The World Wide Web What is animation? Ø Appearance of motion created by displaying a series of still images in sequence p. 86 Next The World Wide Web What is audio? Ø Ø Music, speech, or any other sound Individual compressed sound files that you download from the Web to your computer § Common Web audio file formats are AAC, AIFF, ASF, MP3, WAV, WMA, RA, and QT Ø Ø Once downloaded, you can play (listen to) the contents of the files A podcast is recorded audio, usually an MP3 file, stored on a Web site that can be downloaded to a computer or a portable media player p. 86 - 87 Fig. 2-20 Next The World Wide Web What is streaming audio? The process of transferring audio in a continuous and even flow Enables you to listen to music as it downloads to your computer p. 86 Next The World Wide Web What is video? Ø Ø Consists of full-motion images, most with sound, that are played back at various speeds MPEG (Moving Pictures Experts Group) is popular video compression standard Click to view Web Link, click Chapter 2, Click Web Link from left navigation, then click YouTube below Chapter 2 p. 88 Fig. 2-21 Next The World Wide Web CLICK TO START Next The World Wide Web What is virtual reality (VR)? Ø Ø Use of computers to simulate real or imagined environment Appears as a three dimensional (3-D) space § Used for games and many practical applications p. 88 – 89 Fig. 2-22 Next The World Wide Web What are plug-ins? Ø Ø Programs that extend the capability of a browser You can download many plug-ins at no cost from various Web sites p. 89 Fig. 2-23 Next The World Wide Web What is Web publishing? Ø Development and maintenance of Web pages p. 89 - 90 Fig. 2-24 Next E-Commerce What is e-commerce? Ø Ø Short for electronic commerce Business transaction that occurs over the Internet Business to consumer (B2C) Sale of goods to general public One consumer sells directly to another Consumer to consumer (C2C) Business to business (B2B) Click to view Web Link, click Chapter 2, Click Web Link from left navigation, then click PayPal below Chapter 2 p. 91 - 92 Fig. 2-25 Business providing goods and services to other businesses Next Other Internet Services What is e-mail? Ø Ø Short for electronic mail The transmission of messages and files via a computer network § § § Ø One of the original services on the Internet Messages can consist of simple text or can contain attachments, such as documents, graphics, or audio/video clips Internet access providers usually provide an e-mail program Some Web sites—such as Google Gmail, Windows Live Hotmail, and Yahoo! Mail—provide free e-mail services Click to view Web Link, click Chapter 2, Click Web Link from left navigation, then click E-Mail below Chapter 2 p. 92 - 94 Next Other Internet Services How do you send an e-mail message? p. 93 Fig. 2-26 Next Other Internet Services What is an e-mail address? Ø Unique name that consists of a user name and domain name that identifies the user p. 94 Fig. 2-27 Next Other Internet Services How does an e-mail message travel? Step 1. Using e-mail software, you create and send message Step 2. Your software contacts software on your service provider’s outgoing mail server Step 4. When recipient uses e-mail software to check for e-mail messages, the message transfers from incoming mail server to recipient’s computer Step 3. p. 95 Fig. 2-28 Software on outgoing mail server determines best route for data and sends message, which travels along Internet routers to recipient’s incoming mail server Next Other Internet Services What is a mailing list? Ø Ø Ø Group of e-mail names and addresses given a single name When a message is sent to the mailing list, everyone on the list receives the message To add your name to a mailing list you must subscribe to it; to remove your name you must unsubscribe Click to view Web Link, click Chapter 2, Click Web Link from left navigation, then click Mailing Lists below Chapter 2 p. 96 Fig. 2-29 Next Other Internet Services What is instant messaging (IM)? Ø A real-time Internet communications service that notifies you when one or more people are online and allows you to exchange messages or files p. 96 - 97 Fig. 2-30 Next Other Internet Services What is a chat? Ø Ø Real-time typed conversation that takes place on a computer Chat room is location on server that permits users to discuss topics of interest Click to view Web Link, click Chapter 2, Click Web Link from left navigation, then click Chat Rooms below Chapter 2 p. 97 - 98 Fig. 2-31 Next Other Internet Services What is VoIP (Voice over IP)? Ø Enables users to speak to other users over the Internet p. 98 - 99 Fig. 2-32 Next Other Internet Services What is FTP? Ø File Transfer Protocol—Internet standard that allows you to upload and download files with other computers on the Internet Click to view Web Link, click Chapter 2, Click Web Link from left navigation, then click FTP below Chapter 2 p. 98 – 99 Fig. 2-33 Next Other Internet Services What are newsgroups and message boards? Ø Ø Newsgroup § Online area where users discuss a particular subject Type of discussion group Many Web sites use message boards because they are easier to use Message board § § p. 100 Fig. 2-34 Next Netiquette What is netiquette? Ø Code of acceptable behaviors users should follow while on the Internet Golden Rule: Treat others as you would like them to treat you. p. 100 Fig. 2-35 Next Summary of the Internet and World Wide Web History and structure of the Internet Electronic commerce The World Wide Web Other Internet services Web Publishing Netiquette Chapter 2 Complete ...
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This note was uploaded on 11/29/2009 for the course CSC CSC106 taught by Professor Cordle during the Spring '09 term at Sullivan.

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