ch2 presenting the internet
TRANSCRIPT
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Chapter2Chapter2
Presenting the Internet
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OutlineOutlineThe Internet’s Major Services:Understanding the World Wide
Web.How the Web Works.Web Browsers and HTML Tags.URLs .Ways to Access a URL.Terminology used the Internet.Search Techniques
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The Internet’s Major ServicesThe Internet’s Major Services The World Wide Web Electronic mail News File Transfer Protocol Chat Instant messaging Online services Peer-to-peer services
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The Internet’s Major The Internet’s Major ServicesServices
Electronic mailInstantaneous transmission of documents File Transfer Protocol (FTP)Sends and receives files ChatPublic real time conversation Instant messagingPrivate real time conversation
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The Internet’s Major The Internet’s Major ServicesServices
Internet service provider (ISP):a company that provides local or
regional access to the Internet backbone.
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ConnectionsConnections Dialup• Connects to Internet through phone
line• Modem connects to the phone line• Slow connection
High-speed access• Connect through a special line• 2 – 25 times faster than dialup• DSL, Cable, T1 are common
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Understanding the WWWUnderstanding the WWW
Enables users to view specially formatted documents, called Web pages, on the Internet, also called WWW.
There is a different between the web and the internet:◦The Web is a service (a system for ◦accessing documents) that is supported
by the Internet.
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How the Web WorksHow the Web Works Web documents can be linked togetherbecause they are created in a format known as hypertext. Hypertext: systems provide an easy way to manage large collections of data, which
can include text files, pictures, sounds, movies, and more.
The Web uses a special protocol, called the hypertext transfer protocol, or HTTP.
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How the Web WorksHow the Web Works HyperText Markup Language (HTML).
This language allows a document’s author to insert hypertext links, also called hyperlinks or just links in the document.
HTTP and hypertext links are the foundations of the World Wide Web.
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How the Web WorksHow the Web Works Hypertext document more commonly
called a Web. Web site: is a collection of related
Web pages. Publishing the page :Copying a
page onto a server and, also is called posting or uploading.
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Web Browsers and HTML Web Browsers and HTML TagsTags
A browser :Software program that enables you to access hypertext documents on the Web and then open the documents on the user’s computer.
Two most popular Web browsers:◦Microsoft Internet Explorer◦Netscape Navigator
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Using a Browser And The Using a Browser And The WWWWWW Browser starts on the home page
Navigating the web◦Enter a URL in the browser◦Click a link◦Links are typically blue underlined
words◦Image maps are picture links
When finished, close the browser
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Understanding The Understanding The InternetInternet Browsers
◦Read and translate the HTML◦Display web content
Uniform Resource Locator (URL)◦Address of a web page
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Ways to Access a URLWays to Access a URL
Type the URL in a browser’s address box.
Click a hyperlink that is linked to that URL.
Choose a URL stored in your browser’s Favorites or Bookmarks list.
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Terminology used the Terminology used the InternetInternet Bookmark Frequently visited Web page saved in a browser. Search tools:
oDirectoriesoSearch Engines
Keyword search: Searching for information by typing one or more words.
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Searching the WebSearching the Web The Web is unorganized Directories
◦Categorize the Internet Search engines
◦Find sites by keyword
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Search TechniquesSearch Techniques Quote the exact phrase Use the Boolean operators Avoid common words Use the site’s advanced tools
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Boolean operatorsBoolean operators
Four Boolean operators that are sometimes used in Web searches are AND OR NOT NEAR
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Chapter 2AChapter 2A
End of Chapter