Chapter2Chapter2

Presenting the Internet

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