Ppt Lesson 02


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Ppt Lesson 02

  1. 1. Unit 1—Computer Basics Lesson 2 The Internet and the World Wide Web
  2. 2. Objectives <ul><li>Explain the origin of the Internet and describe how the Internet works. </li></ul><ul><li>Explain the difference between the World Wide Web and the Internet. </li></ul><ul><li>Describe the major features of the Internet. </li></ul><ul><li>Explain how to connect to the Internet. </li></ul>Computer Concepts BASICS -
  3. 3. Objectives (cont.) <ul><li>Describe a browser. </li></ul><ul><li>Identify browser features. </li></ul><ul><li>Apply and use browser features. </li></ul><ul><li>Describe other Internet features. </li></ul>Computer Concepts BASICS -
  4. 4. Evolution of the Internet <ul><li>Early origins </li></ul><ul><ul><li>Can be traced to the 1960s </li></ul></ul><ul><ul><li>U. S. Department of Defense </li></ul></ul><ul><ul><li>Original name was ARPANET </li></ul></ul><ul><ul><li>Steady growth over the next few years </li></ul></ul>Computer Concepts BASICS -
  5. 5. Evolution of the Internet (cont.) <ul><li>In 1990, ARPANET ceased to exist. </li></ul><ul><li>The World Wide Web came into existence in 1992. </li></ul><ul><li>Mosaic, the first browser, was released in 1993. </li></ul><ul><ul><li>A 340% growth in number of users </li></ul></ul>Computer Concepts BASICS -
  6. 6. Internet Continues to Grow Computer Concepts BASICS -
  7. 7. Impact on Society <ul><li>In 2005, over two-thirds of all Americans used the Internet. </li></ul><ul><li>The benefits are numerous and widespread. </li></ul><ul><ul><li>Businesses and individuals benefit. </li></ul></ul><ul><ul><li>Disabled also benefit. </li></ul></ul>Computer Concepts BASICS -
  8. 8. Internet Basics <ul><li>Interoperability </li></ul><ul><ul><li>All brands, makes, and models of computers can communicate. </li></ul></ul><ul><ul><li>Use a set of protocols </li></ul></ul><ul><ul><ul><li>TCP/IP or Transmission Control Protocol and Internet Protocol </li></ul></ul></ul>Computer Concepts BASICS -
  9. 9. The World Wide Web <ul><li>Subset of the Internet </li></ul><ul><li>Document formatted using HTML </li></ul><ul><li>HTTP or hypertext transfer protocol </li></ul><ul><ul><li>Defines how pages are transmitted </li></ul></ul><ul><li>Each Web page has its own address. </li></ul><ul><ul><li>URL: Uniform Resource Locator </li></ul></ul><ul><li>Hypertext (hyperlink or link) </li></ul><ul><ul><li>A link to another location </li></ul></ul>Computer Concepts BASICS -
  10. 10. Top-Level Domain Abbreviations Computer Concepts BASICS -
  11. 11. Accessing the Internet <ul><li>Getting connected </li></ul><ul><ul><li>Connect from home, school, or business </li></ul></ul><ul><ul><li>Requires an ISP </li></ul></ul><ul><ul><li>Communications software </li></ul></ul><ul><ul><li>Web browser </li></ul></ul>Computer Concepts BASICS -
  12. 12. Browser Basics <ul><li>Browser (Internet Explorer) retrieves your requested Web page </li></ul><ul><ul><li>Renders the HTML code to display the page </li></ul></ul>Computer Concepts BASICS -
  13. 13. Browser Components Computer Concepts BASICS -
  14. 14. Internet Explorer Menu and Toolbar Computer Concepts BASICS -
  15. 15. Browser Features <ul><li>Your home page </li></ul><ul><ul><li>Displayed when you launch browser </li></ul></ul><ul><li>Searching </li></ul><ul><li>History </li></ul><ul><li>Favorites </li></ul><ul><li>Controlling access </li></ul><ul><li>Cleanup time </li></ul>Computer Concepts BASICS -
  16. 16. Copy and Save Text, Web Pages, and Images <ul><li>You can </li></ul><ul><ul><li>Save complete Web pages </li></ul></ul><ul><ul><li>Copy and save text </li></ul></ul><ul><ul><li>Copy and save images </li></ul></ul><ul><ul><li>Copy and save URLs </li></ul></ul><ul><li>You can download and install programs. </li></ul>Computer Concepts BASICS -
  17. 17. Other Internet Services <ul><li>Blog or Web log </li></ul><ul><li>Chat rooms </li></ul><ul><li>Instant messaging </li></ul><ul><li>Mailing lists </li></ul><ul><li>Newsgroups and bulletin boards </li></ul><ul><li>Online conferencing </li></ul><ul><li>File Transfer Protocol </li></ul>Computer Concepts BASICS -
  18. 18. Summary <ul><li>No one person or organization can claim credit for creating the Internet. </li></ul><ul><li>Origins of the Internet can be traced to the United States Department of Defense. </li></ul><ul><li>The original name for the Internet was ARPANET. </li></ul><ul><li>Mosaic was the Internet’s first graphical interface. </li></ul>Computer Concepts BASICS -
  19. 19. Summary (cont.) <ul><li>To connect to the Internet from a business, school, or other organization, you probably have a direct connection via a local area network and a network interface card. </li></ul><ul><li>Types of Internet connections include modem and telephone line, DSL, cable modem, wireless, and fiber optics. </li></ul>Computer Concepts BASICS -
  20. 20. Summary (cont.) <ul><li>To connect to the Internet, you need an Internet connection, telecommunications software, and a browser for the Web. </li></ul><ul><li>Interoperability means that all brands, models, and makes of computers can communicate with each other. </li></ul><ul><li>A protocol is a standard format for transferring data between two devices. </li></ul>Computer Concepts BASICS -
  21. 21. Summary (cont.) <ul><li>TCP/IP is the agreed upon international standard for transmitting data. </li></ul><ul><li>The domain name identifies a site on the Internet. </li></ul><ul><li>The Internet is made up of many services. </li></ul><ul><li>The Web is an application that makes use of the Internet. </li></ul>Computer Concepts BASICS -
  22. 22. Summary (cont.) <ul><li>Web pages can be linked through hyperlinks. </li></ul><ul><li>Microsoft Internet Explorer is a popular Web browser. </li></ul><ul><li>The HTTP protocol defines how Web messages are formatted and transmitted. </li></ul><ul><li>A Web site address is referred to as the URL or Universal Resource Locator. </li></ul>Computer Concepts BASICS -
  23. 23. Summary (cont.) <ul><li>Every Web page on the Internet has its own unique address. </li></ul><ul><li>HTML is a protocol that controls how Web pages are formatted and displayed. </li></ul><ul><li>A Web page is coded with HTML markup tags. </li></ul>Computer Concepts BASICS -
  24. 24. Summary (cont.) <ul><li>Other Internet services include blogs, chat rooms, instant messaging, mailing lists, newsgroups, bulletin boards, online conferencing, and FTP. </li></ul>Computer Concepts BASICS -