Transcript Slide 1
Extended Learning Module B The World Wide Web and the Internet B-1 Overview of XLM B B-2 World Wide Web Search Engines Internet Technologies Connecting to the Internet World Wide Web World Wide Web, or Web - a multimediabased collection of information, services, and Web sites supported by the Internet. Internet - a vast network of computers that connects millions of people all over the world. B-3 World Wide Web Web Sites, Addresses, and Pages Web site - a specific location on the Web where you visit, gather information, and perhaps even order products. Web site address - a unique name that identifies a specific site on the Web. Domain name - identifies a specific computer on the Web and the main page of the entire site. B-4 World Wide Web Web Sites, Addresses, and Pages Web page - a specific portion of a Web site that deals with a certain topic. URL (uniform resource locator) - an address for a specific Web page or document within a Web site. Link (hyperlink) - is clickable text or an image that takes you to another site or page on the Web. B-5 World Wide Web Web Sites, Addresses, and Pages Web site address B-6 World Wide Web Understanding Addresses Top-level domain - the last three-letters of a Web site address. Top-level domains include: B-7 com – commercial or for-profit business coop - cooperatives edu – educational institution gov – U.S. government agency mil – U.S. military organization net – Internet administrative organization org – professional or non-profit organization int – international treaties organization info – general information biz – business museum – accredited museums name – personal pro – accountants, doctors, and lawyers, to start World Wide Web Understanding Addresses www.priceline.com - “com” means that Priceline is a commercial organization www.uts.edu.au B-8 “edu” means that UTS is an educational institution. “au” means that country of origin is Australia. World Wide Web Using Web Browser Software Web browser software - enables you to surf the Web. The most popular Web browsers today are: Internet Explorer Netscape Communicator. B-9 World Wide Web Using Web Browser Software B-10 Search Engines Search engine - a facility on the Web that helps you find sites with the information and/or services you want. Directory search engine - organizes listings of Web sites into hierarchical lists. True search engine - uses software agent technologies to search the Internet for key words and then places them into indexes. B-11 Search Engines Who won the Academy Awards in 2002? You can find this information with either a directory or true search engine. B-12 Search Engines Using a Directory Search Engine In Yahoo!, you would click on: Arts & Humanities Awards Movies and Film@ Academy Awards 74th Annual Academy Awards You would then see a list of Web sites with relevant information. See Figure B.5 on page 113. B-13 Search Engines Using a Directory Search Engine (+) limits a search to finding sites that include each word preceded with a + sign. (-) limits a search to finding sites that does not include each word preceded by a – sign. B-14 Search Engines Using a True Search Engine In Ask Jeeves, you would: Type the question, “Who won the Academy Awards in 2002?” Ask Jeeves, would respond with a list of relevant Web sites. B-15 Team Work Finding and Using Search Engines (p. 115) Internet Technologies The Internet Backbone Internet backbone - the major set of connections for computers on the Internet. B-16 Internet Technologies The Internet Backbone Network access point (NAP) - a point on the Internet where several connections converge. Network service provider (NSP) - owns and maintains routing computers at NAPs and even the lines that connect the NAPs to each other. B-17 MCI or AT&T Internet Technologies Internet Service Providers Internet service provider (ISP) - a company that provides individuals, organizations, and businesses access to the Internet. B-18 AOL (commercial) and Juno (free) Internet Technologies Internet Servers B-19 Internet Technologies Internet Servers Internet server computer - provides information and services on the Internet. Web server - provides information and services to Web surfers. Mail server - provides e-mail services and accounts. B-20 Internet Technologies Internet Servers ftp (file transfer protocol) server - maintains a collection of files that you can download. IRC (Internet Relay Chat) server - supports your use of discussion groups and chat rooms. B-21 On Your Own Using a Web Portal (p. 117) Internet Technologies Communications Protocols Communications protocol (protocol) a set of rules that every computer follows to transfer information. B-22 TCP/IP http ftp Internet Technologies Communications Protocols TCP/IP, or transport control protocol/Internet protocol, - transmits information over the Internet. Hypertext transfer protocol (http) - supports the movement of information over the Web, essentially from a Web server to you. File transfer protocol (ftp) - allows you to transfer files of information from one computer to another. B-23 Connecting To The Internet What ISP should you choose? B-24 Do you need Web space - a storage area where you keep your Web site? Is great technical support important? Is money a serious consideration? Is privacy important to you? Connecting To The Internet Communications Software Connectivity software – enables you to use your computer to “dial up” or connect to another computer. Web browser software – enables you to surf the Web. E-mail software, (short for electronic mail software) - enables you to electronically communicate with other people by sending and receiving e-mail. B-25 Connecting To The Internet Telecommunications Hardware Telephone modem – a device that connects your computer to your phone line so that you can access another computer or network. Digital Subscriber Line (DSL) modem – a high-speed Internet connection using phone lines, which allows you to use your phone line for voice communication at the same time. B-26 Connecting To The Internet Telecommunications Hardware Cable modem – a device that uses your TV cable to deliver an Internet connection. Satellite modem – a modem that allows you to get Internet access from your satellite dish. B-27 Connecting To The Internet Telecommunications Hardware The following figure represents a DSL modem connection. B-28 Summary Student Learning Outcomes 1. 2. 3. 4. B-29 Define the relationships among Web site, Web site address, domain name, Web page, and uniform resource locator (URL). Explain how to interpret the parts of an address on the Web. Identify the major components and features of Web browser software. Describe the differences between directory and true search engines. Summary Student Learning Outcomes 5. 6. 7. B-30 Describe the various technologies that make up the Internet. Identify key considerations in choosing an Internet service provider (ISP). Describe the communications software and telecommunications hardware you need to connect to the Internet.