Chapter 1 The Internet and Internet Activities Objectives

Chapter 1 The Internet and Internet Activities Objectives • To learn the brief history of the Internet development • To know the difference between the Internet and the World Wide Web • To be aware of different types of Internet activities • To learn how to use search engines • To know the basic elements of an e-mail MERS Chapter 1 The Internet and Internet Activities 1

1. 1 Internet and World Wide Web MERS Chapter 1 The Internet and Internet Activities 2

1. 1. 1 ARPANET and Internet The Internet: • The Advanced Research Projects Agency Network (ARPANET) by the United States Department of Defense (USDo. D) in 1969 • Only connect a few computers at universities • For military and academic fields How today the Internet has become? MERS Chapter 1 The Internet and Internet Activities 3

The Internet today: • Connect over billions of computers around the world. • Expand to commerce, entertainment and other fields. • Examples: online chat room, e-cards, submit homework online MERS Chapter 1 The Internet and Internet Activities 4

1. 1. 2 Web Wide Web • World Wide Web (WWW) • Proposed by Tim Berners-Lee at the CERN in his paper “Information Management: A Proposal”. • A wide range of information (document, image, audio, and video), which are linked together by hypertext links. MERS The World Wide Web is the universe of network-accessible information, an embodiment of human knowledge. Chapter 1 The Internet and Internet Activities 5

Three main features of the Use a Web browser to read HTML documents and WWW: display them as Web pages Use Hypertext Transfer Protocol (HTTP) as the communication standard MERS Use Hypertext Markup Language (HTML) to write Web pages Chapter 1 The Internet and Internet Activities 6

A brief history of the Internet: 1969 ARPANET 1972 First e-mail program 1993 NCSA Mosaic 1994 Netscape Navigator MERS 1979 USENET 1990 Tim Berners-Lee proposed WWW 1995 Internet Explorer 1995 Yahoo! Chapter 1 The Internet and Internet Activities 1982 TCP/IP 1984 DNS Rapid growth 7

1. 2 Internet Activities MERS Chapter 1 The Internet and Internet Activities 8

The Internet has become an important part of everyday life: • Obtain information by using search engines or browsing Web pages. • Communicate with friends through e-mails, online chat rooms and instant messaging systems. • Share ideas, exchange information and discuss interesting topics in newsgroup. Searching * Education * Entertainment / Leisure * Communications * Business * Sharing / Transferring files * Discussion MERS Chapter 1 The Internet and Internet Activities 9

1. 3 Browsing the Web MERS Chapter 1 The Internet and Internet Activities 10

• Web browsing is one of the most common Internet activities. • Well-known Web browsers: Netscape Browser, Microsoft® Internet Explorer, Firefox, etc. MERS Chapter 1 The Internet and Internet Activities 11

Do you know other Web browsers? Find out more Web browser at http: //www. download. com ！ MERS Chapter 1 The Internet and Internet Activities 12

1. 4 Search Engines MERS Chapter 1 The Internet and Internet Activities 13

1. 4. 1 Keyword search and Directory Search • Use search engine to find information on the Internet. • Common search engines: hk. yahoo. com、 www. google. com. hk and www. msn. com • Search methods: – Keyword search – directory search MERS Chapter 1 The Internet and Internet Activities 14

Does you school has a Web site? Try using keyword search and directory search to find out the URL of your school Web site at http: //hk. yahoo. com！ MERS Chapter 1 The Internet and Internet Activities 15

1. 4. 2 Metasearch Engines and Specialised Search Engines • Besides general search engines, there are other search engines. • Metasearch engines: Special programs that automatically submit your search request to several search engines at the same time. • Specialised search engines: Focus on sub-specific Web sties. MERS Chapter 1 The Internet and Internet Activities 16

Search information about “Hong Kong” on a Metasearch engine Search results from different search engines MERS Chapter 1 The Internet and Internet Activities 17

Search “bird” audio on a specialised search engine Search for Audio MERS Chapter 1 The Internet and Internet Activities 18

1. 5 Electronic Mail MERS Chapter 1 The Internet and Internet Activities 19

1. 5. 1 E-mail Program and E-mail Address • • MERS Using electronic mail (e-mail) is another popular Internet activity. With an e-mail program and the Internet, you can communicate with anyone who has an e-mail address E-mail program: Compose, send and receive e-mails, e. g. , Microsoft® Outlook Express. E-mail address: – user’s name – domain name Chapter 1 The Internet and Internet Activities 20

An e-mail address obtained from Yahoo! Mail: Are the following e-mail addresses correct? MERS Chapter 1 The Internet and Internet Activities 21

Some Web sites provide free Web mail services for you to send and receive e-mails using a Web browser! MERS Chapter 1 The Internet and Internet Activities 22

1. 5. 2 Basic Elements in an E-mail • A typical e-mail message contains three basic elements: header, message and signature. Header Message Signature MERS Chapter 1 The Internet and Internet Activities 23

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