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Search engines powerpoint


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A basic knowledge of search engines and metasearch engines is needed to be a successful internet searcher.

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Search engines powerpoint

  1. 1. Search Engines andMetasearch Engines
  2. 2. Basics• What is the Internet? • A massive network of networks, a networking infrastructure. It connects millions of computers together globally, forming a network in which any computer can communicate with any other computer as long as they are both connected to the Internet.• What is the World Wide Web? • a way of accessing information over the medium of the Internet. It is an information-sharing model that is built on top of the Internet. The Web also utilizes browsers, such as Internet Explorer or Firefox, to access Web documents called Web pages that are linked to each other via hyperlinks. Web documents also contain graphics, sounds, text and video. The Internet, not the Web, is also used for e-mail, which relies on SMTP, Usenet news groups, instant messaging and FTP. So the Web is just a portion of the Internet, albeit a large portion, but the two terms are not synonymous and should not be confused.
  3. 3. The Internet TodayThe link below shows graphically how large the internet is todayand how large it will grow to be in the future:Size of the Internet
  4. 4. 10 Most Popular US Web Parent Companies How many do you recognize?
  5. 5. So What Can We Get on the Internet?News, multimedia Nonprofit, charitable sites Personal blogs, websites Company websites
  6. 6. And…
  7. 7. What’s Not Free on the Internet?
  8. 8. Not…Subscription databases Copyrighted materials: Books, Poetry, Reference Works And everything! People think “everything” is on the internet Research papers
  9. 9. Ahh, the InternetThe Good thing about the Internet – Anyone can post things tothe Web, can Blog, can create a Wiki, anythingThe Bad thing about the Internet – Anyone can post things tothe Web, can Blog, can create a Wiki, anything.Commercial on TV right now about believing everything on theinternet
  10. 10. The Very Short History ofSearch Engines Only 20 years!
  11. 11. Search Engines• First Internet search engine was Archie, created in 1990 in McGill University• WAIS, Wide Area Information Servers were next • Followed by Gopher, and Veronica and Jughead• Growth of the web meant the creation of Web directories and search engines but mostly titles were indexed.• Web Crawler was the first full-text search engine in 1994.• Lycos was created in 1993 and was the first commercial success.
  12. 12. Now?• Web crawlers (sometimes called spiders) follow links• Content is indexed from words on the page or provided by meta-tags• A query is placed, and for a search engine like Google, a cache, or copy of the page is presented. A search engine like AltaVista stores every word match against the query.• Caching always saves the page the search term is on. This can be helpful if the page is updated and the search term is eliminated from the page. Because the term is still there it removes the possibility of “linkrot” when the term is no longer available.
  13. 13. Good Searching & Problems• Each search engine searches differently• Always look to see if there is an advanced search option• Some search engines use proximity searching, which allows users to define the distance between keywordsLook at the link below for information about searchengines and their capabilities:
  14. 14. Rank and BombSearch engines are supposed to rank results based on eitherpopularity or relevancy but many studies have shown otherthings going on. There could be political, economic or socialbiases. Companies can pay to advertise and get a higher ranking.Politically there could be search results that are removedbecause it violates local laws.There is also something called Google Bombing which a webpage is created with a large number of links to cause a page tohave a high rank. An example is a 1999 Google bomb when auser would search “more evil than Satan himself” and it resultedin the Microsoft homepage!
  15. 15. Search Engines to Use in ClassIn all but the last assignment, you may NOT use Google. Theidea is that you learn and compare other search engines.Here are the general search engines to use: • Bing • Blekko • DuckDuckGo • Hakia • Qunitura • Yahoo
  16. 16. Metasearch Engines• Metasearch engines are aggregators, sort of, of information that may be in multiple or one search engine. In one search you will be able to search all the major sources instead of having to search each separately. One of the search engines even searches SlideShare and Wikipedia in their main search.• This link explains how Metasearch engines work and why you might want to use them and add them to your Internet searching tool belt.•
  17. 17. Metasearch EnginesMetasearch engines are where you will find some of the morecreative functions. For instance, iboogie sorts the results intosubcategories, while blekko claims to have spam free searching.Here are the metasearch engines to choose to use in yourassignment: • mrsapo • iboogie • ixquick • Mamma • Metacrawler • Zapmeta • Zuula
  18. 18. For more information about the chosen SearchEngines and Metasearch Engines connect to thislink: have checked all of the search engines and metasearch enginesthat I have given you to use for assignments. At the time of thiscreation, they all worked. However, looking at the link abovemay give you information about your chosen source if it isn’tworking for you very well.
  19. 19. Readings• This link has several tutorials linked to it. I would look through what Southern Oregon University has linked to their web site and glance through the tutorials for information. Depending on your familiarity and comfort with this topic you may need to spend more or less time. However, it is wise to look through them even if you are exceedingly comfortable searching because things on the web change by the moment. And really, how much time have you spent really learning about search engines and searching?•