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SEARCH  ENGINES,[object Object],- Prepared By,[object Object],Chinmay Patel ,[object Object],[09BCE038],[object Object],- Under guidance of,[object Object],Dr. Sanjay Garg,[object Object]
[object Object]
 Different  search engines
  History
  Working of search engines
   Web crawlers
   Advanced search techniques of google,[object Object]
[object Object],      information on the World wide web and FTP servers.,[object Object],[object Object],results and are often called hits. ,[object Object],[object Object],information and other types of files. ,[object Object],[object Object],    databases or open directories.,[object Object],[object Object],     editors, search engines operate algorithmically or are a,[object Object],mixture of algorithmic and human input.,[object Object]
[object Object],e.g. Google, Yahoo, Aol, Safari, msn etc.,[object Object],[object Object],     its creativity only.,[object Object]
History,[object Object],[object Object],     Archie. The name stands for "archive" without the "v". ,[object Object],[object Object],     J. Peter Deutsch, computer science students at McGrill,[object Object],     University in Montreal.,[object Object],[object Object],    files located on public anonymous FTP (File Transfer ,[object Object],    protocol) sites, creating a searchable database of file,[object Object],    names; however, Archie did not index the contents of ,[object Object],    these sites since the amount of data was so limited it ,[object Object],    could be readily searched manually.,[object Object]
[object Object],    prominence. The company achieved better results for,[object Object],many searches with an innovation called Page Rank. This,[object Object],   iterative algorithm ranks web pages based on the ,[object Object],   number and Page Rank of other web sites and pages ,[object Object],   that link there, on the premise that good or desirable ,[object Object],   pages are linked to more than others. ,[object Object],[object Object],Inktomi's search engine. Yahoo! acquired Inktomi in ,[object Object],   2002, and Overture(which owned Alltheweb and,[object Object],AltaVista) in 2003. Yahoo! switched to Google's search ,[object Object],   engine until 2004, when it launched its own search ,[object Object],   engine based on the combined technologies of its ,[object Object],   acquisitions.,[object Object]
How  web  search  engine works,[object Object],High-level architecture of a standard Web crawler,[object Object]
[object Object],        1.  Web Crawling,[object Object],        2.  Indexing,[object Object],        3.  Searching ,[object Object],[object Object]
These pages are retrieved by a Web Crawler  — an automated Web browser which follows every link on the site. The contents of each page are then analyzed to determine how it should be indexed (for example, words are extracted from the titles, headings, or special fields called meta tags ). ,[object Object]
 When a user enters a query into a search engine the engine examines its index and provides a listing of best-matching web pages according to its criteria, usually with a short summary containing the document's title and sometimes parts of the text.
The index is built from the information stored with the data and the method by which the information is indexed. Unfortunately, there are currently no known public search engines that allow documents to be searched by date. ,[object Object]
The engine looks for the words or phrases exactly as entered.
Some search engines provide an advanced feature called proximity search which allows users to define the distance between keywords.
Natural language queries allow the user to type a question in the same form one would ask it to a human. A site like this would be ask.com.,[object Object]
While there may be millions of web pages that include a particular word or phrase, some pages may be more relevant, popular, or authoritative than others.
Most search engines employ methods to rank the results to provide the "best" results first.
How a search engine decides which pages are the best matches, and what order the results should be shown in, varies widely from one engine to another. The methods also change over time as Internet usage changes and new techniques evolve.,[object Object]
Most Web search engines are commercial ventures supported by advertising revenue and , as a result , some employ the practice of allowing advertisers to pay money to have their listings ranked higher in search results.

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Search engine

  • 1.
  • 2.
  • 3. Different search engines
  • 5. Working of search engines
  • 6. Web crawlers
  • 7.
  • 8.
  • 9.
  • 10.
  • 11.
  • 12.
  • 13.
  • 14.
  • 15. When a user enters a query into a search engine the engine examines its index and provides a listing of best-matching web pages according to its criteria, usually with a short summary containing the document's title and sometimes parts of the text.
  • 16.
  • 17. The engine looks for the words or phrases exactly as entered.
  • 18. Some search engines provide an advanced feature called proximity search which allows users to define the distance between keywords.
  • 19.
  • 20. While there may be millions of web pages that include a particular word or phrase, some pages may be more relevant, popular, or authoritative than others.
  • 21. Most search engines employ methods to rank the results to provide the "best" results first.
  • 22.
  • 23. Most Web search engines are commercial ventures supported by advertising revenue and , as a result , some employ the practice of allowing advertisers to pay money to have their listings ranked higher in search results.
  • 24. Some search engines which do not accept money for their search engine results make money by running search related ads alongside the regular search engine results.
  • 25.
  • 26.
  • 27.
  • 28.
  • 29. They continuously keep on crawling the web and find new web page that have been added to the web ,pages that have been removed from the web.
  • 30. When you query a search engine to find information, it is actually searching through the database which it has created and not actually searching the Web. Therefore result is provided within sort span of time by search engine.
  • 31. They will begin with a popular site,indexing the words on its page and following every link found within site.
  • 32.
  • 33. It built its initial system to use multiple spiders,usually 3 at a time.
  • 34. Each spider could keep 300 connections to web pages open at a time.
  • 35. At its peak performance,its system can crawl over 100 pages per second , generating around 600 kilobytes of data each second.
  • 36.
  • 37. It was built to index every significant word on a page,leaving out the articles a,an, and the.
  • 38. Differents approaches usually attempt to make the spider operate faster and efficiently.
  • 39. Some spider will keep track of the words in the title,sub-headings and links,along with 100 most frequently used words on the page and each word in the first 20 lines of text.
  • 40.
  • 41.
  • 42. Google provides some special commands that we can use to get more specific results back from searches.
  • 43.
  • 44. Another of the basic commands is the OR operator. If we write [+hotels OR resorts] and we'll notice that the results produce just that : web pages for either key phrase: hotels or resorts.
  • 45.