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  • Photo credit: ©2007JupiterImages Corporation
  • Photo credit : (top) ©2007JupiterImages Corporation
  • Microsoft product screen shot reprinted with permission from Microsoft Corporation.
  • Microsoft product screen shot reprinted with permission from Microsoft Corporation.
  • Microsoft product screenshot reprinted with permission from Microsoft Corporation
  • Teacher’s Notes: The term Uniform Resource Locator has replaced Universal Resource Locator as the accepted definition of URL.
  • Screenshot reproduced with permission of Yahoo! Inc © 2007 by Yahoo! Inc. YAHOO! and the Yahooligans! logo are trademarks of Yahoo! inc.
  • Photo credit : ©2007JupiterImages Corporation
  • Photo credit : ©2007JupiterImages Corporation

Transcript

  • 1. The Internet Hardware and Networks Icons key: For more detailed instructions, see the Getting Started presentation Flash activity. These activities are not editable. Teacher’s notes included in the Notes Page Web addresses1 of 21 © Boardworks Ltd 2007
  • 2. Learning objectives Describe the uses of the Internet. Know the processes behind sending e-mails and browsing the web. Understand the uses of the World Wide Web, web browsers and websites. 2 of 21 © Boardworks Ltd 2007
  • 3. What is the Internet? The Internet is a wide area network (WAN) of networks that connects governments, people and companies all over the world. 10 Downing Street, London, England Koji Araki, Sydney Opera Japan House, Australia The Internet Jim’s Skateboards Patel’s Fine Silks, India USA 3 of 21 © Boardworks Ltd 2007
  • 4. Where did it begin? The Internet began in the 1980s to allow US universities and research scientists to share computer resources. It grew so much that by the 1990s it had become possible for people to use the Internet from home. The World Wide Web (www) was developed to make browsing (viewing) easier through http (hypertext transfer protocol). http is a set of standards that allows web browsers and servers to communicate. 4 of 21 © Boardworks Ltd 2007
  • 5. Uses of the Internet 5 of 21 © Boardworks Ltd 2007
  • 6. How does it work? When you connect to the Internet, you connect your computer to an Internet Service Provider (ISP). This is done through telephone or cable services. An Internet Service Provider is the company you pay to let you connect to the Internet. Eg. AOL, BT, Orange, Tiscali etc. The ISP will provide you with a browser, a broadband modem and sometimes a wireless router. The ISP will give you e-mail accounts and web space to upload a web site onto. 6 of 21 © Boardworks Ltd 2007
  • 7. Modem Connection to the internet is normally done through the telephone line. Computer signals are digital but normal telephone lines are analogue, so you need an analogue to digital converter if you are using an analogue telephone line. This is called a modem (modulator/demodulator). 7 of 21 © Boardworks Ltd 2007
  • 8. What do you need to connect to the Internet? • Most computers nowadays are bought Internet Ready • This means they have got a Modem already installed • They have a browser already installed • A connection to the telephone line • They have a link to an Internet Service Provider 8 of 21 © Boardworks Ltd 2007
  • 9. Broadband and ISDN Broadband connections connect through an ADSL modem. It is a way of transmitting data at high speeds through existing telephone lines. Broadband allows the user fast download speeds and the ability to stay connected to the service without having to dial up. Broadband allows the user to use their telephone at the same time as surfing the Internet 9 of 21 © Boardworks Ltd 2007
  • 10. Connecting to the Internet 10 of 21 © Boardworks Ltd 2007
  • 11. Features of the internet • WWW • E-mail • Instant messaging • Discussion groups 11 of 21 © Boardworks Ltd 2007
  • 12. WWWThe World Wide Web (WWW) was designed to make theInternet easier to use.It uses browsers, like Internet Explorer and Mozilla Firefox,to load html web pages. 12 of 21 © Boardworks Ltd 2007
  • 13. Just browsing… When people look at sites on the World Wide Web, they do it through a browser. A browser first loads a home page that the user chooses. A browser has buttons to move forward and back, to refresh pages and to stop them loading. It can store a list of favourite websites that the user might want to look at again. It can give a history of all the websites the user has visited over the past week or so. 13 of 21 © Boardworks Ltd 2007
  • 14. Web browsers Browsers also remember. The history function allows you to see the sites you visited over a period of time. Web browsers can also look after security and privacy. Many browsers now come with a pop-up blocker to stop unwanted adverts appearing and browsers can also block cookies. Cookies are small files of information sent backwards and forwards between websites and web browsers. Many sites use them to track user preferences and shopping habits. Some people do not like to give out this information, and set their browsers to block cookies. 14 of 21 © Boardworks Ltd 2007
  • 15. Websites A website is a collection of web pages or files and documents linked together using hyperlinks. A site is uploaded to a server on the WWW so that other people can see it. It has its own address, which is also known as the URL – Uniform Resource Locator; this usually begins with http://www. Typing the URL will take a user straight to the home page of the site. You can also find websites by typing key words into a search engine. 15 of 21 © Boardworks Ltd 2007
  • 16. Clever stuff A web page looks like one item but in fact it is made up of many types of information (graphics, text, sound etc.) stored as different files. It is possible to: click on hyperlinks to take you to other pages have animations, sound or video in addition to text and graphics fill in online forms to ask for information or give your opinion download pictures and information to save on your computer. 16 of 21 © Boardworks Ltd 2007
  • 17. Web pages Web pages can contain pictures, videos, animated graphics and sounds as well as text. File sizes for multimedia can be very large and this can slow down the loading of the web page. 17 of 21 © Boardworks Ltd 2007
  • 18. Web addresses - URLs URLs are usually made up of these parts: www, standing for World Wide Web an organization name (.boardworks) a top level domain (.co) a country (.uk). There are many top level domains, for instance .com, .org (organization), .sch (school), .ac (university). When you are deciding whether the information from a website is reliable, take a look at the URL as it will give you some idea about the source of the information. 18 of 21 © Boardworks Ltd 2007
  • 19. All in the name 19 of 21 © Boardworks Ltd 2007
  • 20. Instant messaging in action 20 of 21 © Boardworks Ltd 2007
  • 21. Discussion Groups / Newsgroups These are like an online notice board or bulletin: Individuals connect to a site on the internet and post messages When other people visit the site they can post answers or their own messages Normally groups are subject specific MAILING LISTS Discussion list E-newsletter list Announcement list 21 of 21 © Boardworks Ltd 2007
  • 22. Match them up 22 of 21 © Boardworks Ltd 2007
  • 23. Search Engine This is a web site that allows the user to search for a specific subject or web site. The user keys in keywords which the search engine then looks up in it’s database Web spiders are used to crawl the web collecting data about web sites to store in it’s database 23 of 21 © Boardworks Ltd 2007
  • 24. Advantages Convenience Speed Quality Quantity Up-to-date information available 24/7 Access Multimedia virtual tours 24 of 21 © Boardworks Ltd 2007
  • 25. Disadvantages Validity – information is not always reliable or accurate Hardware can break down Software may not run properly Non-permanent source of information Security issues Viruses 25 of 21 © Boardworks Ltd 2007
  • 26. What do you think? 26 of 21 © Boardworks Ltd 2007