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Because so much of the content of Google Scholar's index comes from licensed commercial journal content, most users will discover that clicking on a link in Google Scholar's search results may reveal only an abstract-not full text-accompanied by a pay-per-view option. It retrieves document or page matches based on the keywords searched and then organizes the results using a closely guarded relevance algorithm. Like the larger Google search engine index, Google Scholar is fast and easy to search. Although Google does not divulge the number or names of publishers that have entered into crawling or indexing agreements with the company, it is easy to see why publishers would be eager to boost their content's visibility through a powerhouse like Google. Since 2003, Google has entered into numerous individual agreements with publishers to index full-text content not otherwise accessible via the open Web.

Specialized bibliographic databases like OCLC's Open WorldCat and the National Library of Medicine's PubMed are also crawled. Much of Google Scholar's index derives from a crawl of full-text journal content provided by both commercial and open source publishers. The company claims to have full-text content from all major publishers except Elsevier and the American Chemical Society, as well as hosting services such as Highwire and Ingenta. Google Scholar is a subset of the larger Google search index, consisting of full-text journal articles, technical reports, preprints, theses, books, and other documents, including selected Web pages that are deemed to be вЂњscholarly.вЂќ Although Google Scholar covers a great range of topical areas, it appears to be strongest in the sciences, particularly medicine, and secondarily in the social sciences. Even now, much remains unknown about its source content, indexing, or relevance algorithms. What exactly is Google Scholar? The parent company has been typically coy with explanatory information on the product since its launch. Who would have thought that a research database could create such a buzz? Librarians-particularly medical and science librarians-have been talking and writing about it ever since. In mere weeks, Google's astonishing brand recognition and promotional machine propelled Google Scholar into the public's consciousness. Nothing quite prepared the library world for the introduction of Google Scholar in November 2004.

Keyword for google search engine