人教版高中英语选修计算机英语WebPublishing.ppt

The Internet and World Wide Web What are some services found on the Internet? Discussion The Internet The Internet is a worldwide group of networks that links millions of business, government agencies, schools, and individuals. How did the Internet originate? History of the Internet Next History of the Internet Today More than 350million host nodes 1969 Four host nodes 1984 More than 1,000 host nodes Who controls the Internet? No one —— it is a public, cooperative, and independent network Several organizations set standards History of the Internet Slow-speed technology Dial-up accessmodem in your computer uses a standard telephone line to connect to the Internet Connection must be established each time you log on. How the Internet works High-speed connection Connection is always on — whenever the computer is running. DSL, cable modem,fixed wireless, Wi-Fi, and satellite modems What are ways to access the Internet? 1.ISP, Regional or National 2.OSP (AOL and MSN, for example) 3.Wireless Internet Service Provider How the Internet works The World Wide Web A worldwide collection of electronic documents 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 What is a Web browser? Firefox Program that allows you to view Web pages Opera Safari The World Wide Web MicrosoftInternetExplorer Netscape What is multimedia? Application combining text with other media elements Graphics Animation Audio Video Virtual reality Plug-Ins The World Wide Web What graphics formats are used on the Web? The World Wide Web BMP GIF TIFF JPEG PNG What is animation? Appearance of motion created bydisplaying a series of still imagesin sequence The World Wide Web Other Internet Services What is E-mail? Short for electronic mail The transmission of messages and files via a computer network One of the original services on the Internet What is instant messaging