1 / 10

The Internet

Learn the definition and history of the Internet, from its origins in the 1960s to its widespread usage in the 1990s. Discover how it works, navigate the web, and understand the importance of search engines.

peggyr
Download Presentation

The Internet

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Internet

  2. The Internet: A Definition • Short for Internetwork • AKA: The World Wide Web, or the Net • This is defined by the system of communications channels • Cable • Satellite • Fiber Optics • Telephone • A Network of Networks • Connected by a common set of rules: TCP/IP • Populated by services: • WWW, Communications, Data Transfer

  3. History • Advanced Research Projects Administration • From Dept of Defense • Funding of Communications resources • First to Universities and Tech Companies • UCLA & SRI Int’l – 10/29/69 • UC Santa Barbara, U. of Utah • Went international in the 70s • UK, Sweden, Norway Wikipedia, 2012

  4. History… continued • 1980s • National Science Foundation - 1981 • TCP/IP standardized • Protocols that make communications possible • NSF Net expanded to allow access to supercomputers – 1985 • Commercial usage • CompuServe, America Online, Prodigy • Email, live chat, remote access to databases • 1989 – Tim Berners Lee – Hyper Text Markup Language • Protocols for graphical display of the World Wide Web • 1990s • Public can surf the web with Web Browsers • Dial-Up services and special Web Browsing software • Had to pay for each • Uses in business, gaming, personal life, communications • Huge impacts! • eComerce, eMail, eCommunications, eActivism • So Many eThings!

  5. The World Wide Web • Public can surf the web with Web Browsers • 1993 – Mosaic Graphical Web Browser • 1994 – Netscape Navigator • 1995 – Microsoft Internet Explorer • Became and remains the #1 browser • Bundled with Windows (#1 Operating System) • 1996 – Opera (mostly used on mobile devices now) • 1998 – Netscape becomes Mozilla Firefox • 2003 – Apple Safari • Bundled with the computer • 2008 to 2010 – Google Chrome

  6. How Does It Work? Client Web Browser URL Browser sends DNS request DNS returns IP Browser sends “GET” to IP ISPs take packets of data through many routers and networks Server receives GET and returns packets of data Again, networks Local machine receives requested data (2010, HowStuffWorks.com)

  7. The Internet • Top of the screen is a Address Bar • This defines the URL of the website or file currently being explored • URL: Universal Resource Locator • essentially like a street address but it doesn’t refer to an actual physical location, but a file location on a server or in a directory http://www.nytimes.com/gst/mostpopular.html/ Hyper Text Transfer Protocol Domain Name As registered with a Domain Name Serivce Top-Level Domain Defining type of domain Path or subdirectory and actual page file • How does this work? • Hyper Text Markup Language: • A simple programming language that universally tells a web browser how to set up and define a web page • Gives formatting and parameters for display

  8. A simple web site • Start → Accessories→ Notepad • Enter in the text • Save As: • index.html • To Desktop • Open with a web browser • Should automatically choose this <html> <head> <title>A simple web page</title> </head> <body> This is a really simple Web Page! </body> </html>

  9. Navigating the Internet • Very large with well over 30billion registered websites • Also full of questionable content • Identify some useful Search Engines: http://www.yahoo.com/ http://www.google.com/ http://www.ask.com/ http://www.bing.com/

  10. Let’s compare these web search engines… • Everyone choose at least one of these services • You can open multiple tabs at the top of the web browser content frame • Brainstorm topic: • Type keywords into search bar and hit enter • Describe top 5 returned items • What are they? • Do they want money? Personal info?

More Related