Introduction to the Internet and World Wide Web by dns10434


									Introduction to the Internet and
      World Wide Web
The Internet
 A network of networks
 Began in 1969 as ARPAnet (Advanced
  Research Projects Agency)
 No central authority and thus impossible to
  state the precise size
 The Internet is not free just because you
  may not pay for it
The World Wide Web
 A subset of the Internet consisting of all
  computers with hypertext or hypermedia
 These documents contain references (links)
  to other documents which may be on a
  different computer anywhere in the world
 Began in 1991 at the European Particle
  Physics Laboratory (CERN) in Switzerland
A Client/Server Model
 A server (Web server or Web site) is any
  computer that stores then downloads
  hypermedia documents
 A client is any computer that requests then
  displays hypermedia documents
 Every client must be able to display every
  document from every server and does so
  through a browser (e.g., Netscape or
  Internet Explorer)
    Acronyms Abound
 HTTP - HyperText Transfer Protocol is used to
  transmit hypermedia documents
 HTTPS - A secure protocol for confidential
  transactions (e.g., credit cards)
 HTML - HyperText Markup Language is the
  language used to write hypermedia documents
 TCP/IP - Transmission Control Protocol/
  Internet Protocol - governs the flow of data
  across the Internet
URL Format
 You can guess at the URL using the general
  form of an “”
 Examples:
My Favorite Web Page
Suggestions for Searching
 Use the Search button on the Internet
  Explorer Toolbar
 Try multiple search engines on one query
 Be aware of logical operators - AND, OR,
  and NOT
 Search on a concept; e.g., “first ladies” for
  “Eleanor Roosevelt”
 Set bookmarks or favorites

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