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     Google uses sophisticated next-generation technology to produce the right results fast with every query. Google returns relevant results because it responds to your query using an automated method that ranks relevant websites based on the link structure of the Internet itself.

Google is designed to impose order on information chaos. It's what a search service should be; not an edited, limited directory or a list of results that have been auctioned to the highest bidder, but a thoughtful method of organizing the Internet according to its own structure.

Google has revolutionized searching on the web with its patent-pending PageRankTM technology. PageRank leverages the structural nature of the web, which is defined by the way in which any web page can link to any other web page, instantly, directly, and without an intermediary. In a sense, this link structure automatically democratizes the Internet. It eliminates hierarchy and enables information and ideas to flow unimpeded from site to site.

PageRank Explained
PageRank capitalizes on the uniquely democratic characteristic of the web by using its vast link structure as an organizational tool. In essence, Google interprets a link from page A to page B as a vote, by page A, for page B. Google assesses a page's importance by the votes it receives. But Google looks at more than sheer volume of votes, or links; it also analyzes the page that casts the vote. Votes cast by pages that are themselves "important" weigh more heavily and help to make other pages "important."

These important, high-quality results receive a higher PageRank and will be ordered higher in results. In this way, PageRank is Google's general indicator of importance and does not depend on a specific query. Rather, it is a characteristic of a page itself based on data from the web that Google analyzes using complex algorithms that assess link structure.

Of course, important pages mean nothing to you if they don't match your query. So, Google uses sophisticated text-matching techniques to find pages that are both important and relevant to your search. For instance, when Google analyzes a page, it looks at what those pages linking to that page have to say about it.

Google's complex, automated search methods preclude human interference. Unlike other search engines, Google is structured so no one can purchase a higher PageRank or commercially alter results. A Google search is an honest and objective way to find high-quality websites, easily.


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  Finding Chemical Information on the Web - the User's Viewpoint
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  CrossRef Search (2004-09-29)
  Google Scholar

Summary by 黄苏华 on 2000-04-19

Last updated by 聂峰光 on 2003-12-30

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