GOOGLE SEARCH ENGINE Presented By Richa Manchanda
What is Google search? Google search is a Web search engine owned by Google.Inc , and is the most used search engine on the Web. Google receives several hundred million queries each day through its various services .
History……… Google began in January 1996 as a research project by Larry Page, a Ph.D. student at Stanford he was soon joined by Sergey Brin , a fellow Stanford Ph.D. student they were In search for a dissertation theme, Page considered—among other things exploring the mathematical properties of the World Wide Web , understanding its link and structure.
Left to right, Eric E. Schmidt, Sergey Brin and Larry Page of Google………
Web search engine Web search engines work by storing information about many web pages, which they retrieve from the WWW itself These pages are retrieved by a Web crawler an automated Web browser which follows every link it sees.
The contents of each page are then analyzed to determine how it should be indexed
Data about web pages are stored in an index database for use in later queries.
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.
It accepts queries as a simple text area, and breaks up the user's text into a sequence of search terms, which will be words that are to occur in the results, but may also be phrases, delimited by quotations marks ("), qualified terms, with a prefix such as "+", "-", or one of several advanced operators, such as "site:”
Google’s Advanced Search web form gives several additional fields which may be used to qualify searches by such criteria as date of first retrieval.
Query expansion Query expansion (QE) is the process of reformulating a seed query to improve retrieval performance in information retrieval operations. Query expansion involves techniques such as: >Finding synonyms of words, and searching for the synonyms as well . >Finding all the various morphological forms of words by stemming each word in the search query . >Fixing spelling errors and automatically searching for the corrected form or suggesting it in the results. >Re-weighting the terms in the original query .
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. The primary goal is to provide high quality search results over a rapidly growing World Wide Web .
Google employs a number of techniques to improve search quality including page rank, anchor text, and proximity information
A large-scale web search engine is a complex system and much remains to be done Our immediate goals are to improve search efficiency and to scale to approximately 100 million web pages Some simple improvements to efficiency include query caching, smart disk allocation. Another area which requires much research is updates. Future Work