The world wide web
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The World Wide Web The Web Accessible to anyone with an Internet connection Content of the web Text Audio Video Hyperlinks Usually blue and underlined Clicking on a hyperlink takes you to information that is associated with the current web page. Multimedia Began in 1989 The Web

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The web l.jpg
The Web

  • Accessible to anyone with an Internet connection

  • Content of the web

    • Text

    • Audio

    • Video

    • Hyperlinks

      • Usually blue and underlined

      • Clicking on a hyperlink takes you to information that is associated with the current web page.

    • Multimedia

  • Began in 1989


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The Web

  • Began in 1989

    • Tim Berners-Lee proposed the idea of the web to CERN

  • 1993

    • Web declared open to anyone who would like to use it.

    • Marc Andreessen introduced Mosaic™

      • Mosaic is the first graphical web browser

      • Later became Netscape.


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How URL’s Work

  • URL

    • Uniform Resource Locator

    • The address for a place on the WWW.

    • Uses names instead of numbers ex. www.yahoo.com and not 192.168.123.120

  • User types the address (URL) of a web site into the location area in a browser and presses return.

  • The browser then submits the information to your internet service provider (ISP) ie Earthlink or AOL


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How URL’s Work

  • The information reaches a DNS (domain name server)

  • The DNS translates the URL into a corresponding IP address.

    • IP stands for Internet Protocol

    • IP address is a four part number for a specific computer on the internet. Ex. 12.22.118.3

  • If there is a corresponding IP then the browser is sent the page that has been requested.

  • If there is no IP that matches then an error is sent to the browser


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Getting Connected

  • Connection types

    • Dial up

    • Dedicated

  • Service Providers

    • ISPs can be very large corporations or run by a local business

  • Browser

    • There are many to choose from. Each has strengths and weaknesses.


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Getting Connected: Dial-Up

  • Dial-up:requires a modem to connect to the network through telephone lines.

  • This requires the data signal to be changed to and from analogue.

  • Speeds up to 56kbps


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Getting Connected: Dedicated

  • Dedicated Connection: directly connected to the network. No need for a phone modem nor telephone company.

  • Speeds up to and beyond 1.5 mbps (1500kbps)


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Service Providers

Def.- A service provider is a company that gives you access to the internet. The money you pay this company allows you to dial-up a connection to the Internet or provides the equipment that you use to connect to the Internet.

  • Earthlink

  • AOL

  • NetZero


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Browsers

Your window to the Internet.


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Browsers

A browser is a program that allows you to view pages on the WWW. It is the program that reads html so that you can view the page. You can think of it as a ‘window’ to the WWW.



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Internet Explorer

You will find many of the same features here. Instead of bookmarks, you have “Favorites.” There is also a “History” tab that will allow you to see where you have been.





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  • Back Button-Takes you back to the previous page. If you hold your mouse down on the back button you get a list of all the websites you have visited during the current session.

  • Forward Button- The opposite of the back button.

  • Home- What ever home page your service provider defaults to. You can change this.

  • Location- This is where the address or URL is displayed. You can type an address here.

  • Search Button- One way to search, Netscape uses “Excite” as its search engine

  • Reload Button-Clicking this causes the page to reload and show any changes. Holding shift and reload tells the browser to skip the cache and get the newest page on the server.


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  • Menu items:

    • File - print, save

    • Edit - copy, paste,search option

    • View - The way things look

    • Go - back, home, all web sites during current session

    • Bookmarks - Add a bookmark, see list of bookmarks, edit bookmarks.

    • Communicator - This will take you to other parts of the program.

    • Help


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Links

  • When ever you click on something, and the browser takes you somewhere, you have clicked on a link. A link can be a word, a picture, a button, etc. Links can be thought of as connections to associated information.

  • Clicking on a link takes you either to another web page on the same web site, or to another web site altogether.


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Bookmarks

  • Bookmarks offer a convenient means to retrieve pages whose locations (URLs) you've saved. You store your bookmarks in a list that's saved on your hard disk. Once you add a bookmark to your list, the item stays until you remove it.


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