Computer Concepts Computer Concepts --Illustrated Illustrated Introductory, Seventh EditionIntroductory, Seventh EditionUNIT G:The Web and E-CommerceIntroducing Web TechnologyIntroducing Web TechnologyWeb - collection of documents called Web pages ¾ Accessed over Internet¾ Related by using linksWeb site - Collection of related Web pages accessed using browserWeb Page - HTML document containing embedded HTML tags¾ Specify how document should be displayed or contain links to other documents, graphics, or sound or video filesComputer Concepts – Illustrated Introductory, Seventh EditionIntroducing Web TechnologyIntroducing Web TechnologyComputer Concepts – Illustrated Introductory, Seventh EditionWeb Page ExampleIntroducing Web TechnologyIntroducing Web TechnologyLink (hyperlink, hypertext link)¾ Navigation tool on Web page¾ Click to open and view related documentsHypertext Transfer Protocol (HTTP)¾ Communications protocol used to transport data over WebHypertext Markup Language (HTML)¾ Set of specifications used to create Web pagesUniform Resource Locator (URL)¾ Unique address used to identify each Web pageComputer Concepts – Illustrated Introductory, Seventh EditionIntroducing Web TechnologyIntroducing Web TechnologyWeb server¾ Computer that uses special software to transmit Web pages over Internet¾ Uses HTTP software• Always running when server is on• Ready to take requestsComputer Concepts – Illustrated Introductory, Seventh EditionIntroducing Web TechnologyIntroducing Web TechnologyHTTP status code¾ Indicates whether or not request can be fulfilledComputer Concepts – Illustrated Introductory, Seventh EditionExamining Types of Web SitesExamining Types of Web SitesDomain name¾ Key component of URLs and email addresses¾ Ends with extension that indicates its top-level domainComputer Concepts – Illustrated Introductory, Seventh EditionExamining Types of Web SitesExamining Types of Web SitesSharing opinions and ideas on Web¾ Blog - Web site where people can provide commentary or news on subject• Some people use blogs for personal online diaries¾ Wiki – Collaborative Web site accessed and edited by anyone in world who wants to contribute¾ Web 2.0 - Refers to newand innovative ways ofusing Web• Uses same Internetcommunications infrastructureas original WebComputer Concepts – Illustrated Introductory, Seventh EditionExamining Types of Web SitesExamining Types of Web SitesPodcasts - Files distributed through downloads or use of feed such as RSSVideocasts - Similar to podcasts, but with video rather than audio filesRSS (Rich Site Summary or Really Simple Syndication) - Format for feeding or syndicating content from Web sites to your computerComputer Concepts – Illustrated Introductory, Seventh EditionExamining Types of Web SitesExamining Types of Web SitesSocializing on WEB¾ Social networking sites• Facebook, Classmates, MySpace, Bebo¾ Instant Messaging (IM)• One-on-one real-time messaging over networkFile sharing (P2P file sharing)¾ Exchanging files from one computer to another directly over Internet• Bit Torrent - file sharing protocol that distributes role of file servers across many computers• File sharing raises ethical issuesComputer Concepts – Illustrated Introductory, Seventh EditionIntroducing Web Page AuthoringIntroducing Web Page AuthoringHTML - markup languageHTML tags – Used by authors to mark up documents¾ Specify how document should appear on screen or printed pageHTML - several versions¾ HTML 4¾ XHTMLComputer Concepts – Illustrated Introductory, Seventh EditionIntroducing Web Page AuthoringIntroducing Web Page AuthoringComputer Concepts – Illustrated Introductory, Seventh EditionSource HTML Document and Its Web PageIntroducing Web Page AuthoringIntroducing Web Page AuthoringWeb authoring software¾ Provides tools specifically designed to enter and format Web page text, graphics, and linksComputer Concepts – Illustrated Introductory, Seventh EditionIntroducing Web BrowsersIntroducing Web BrowsersAll browsers share common features and capabilities¾ Space for entering URLs¾ Back button¾ Forward button¾ Home page selection¾ Print command¾ Stop button¾ Find command¾ BookmarksComputer Concepts – Illustrated Introductory, Seventh EditionIntroducing Web BrowsersIntroducing Web BrowsersComputer Concepts – Illustrated Introductory, Seventh EditionPopular BrowsersComputer Concepts – Illustrated Introductory, Seventh EditionPopular BrowsersIntroducing Web BrowsersIntroducing Web BrowsersMozilla FirefoxGoogle ChromeIntroducing Web BrowsersIntroducing Web BrowsersBookmarkHistoryHelper application (add-on, plug-in, player)Web cache¾ Browser gets pages and graphics to form Web page¾ Material is stored in temporary files called Web cache or browser cache¾ Allows speedier switching back and forth between sitesComputer Concepts – Illustrated Introductory, Seventh EditionExercisesWrite your answers and send them to [email protected]: exercises Concept Unit G-1Explain the following terms:¾ HTML¾ Web cache¾