Search Engine History

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Google Began its Existance (1998)

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Google had its rise to success in large part due to a patented algorithm called PageRank that helps rank web pages that match a given search string. Previous keyword-based methods of ranking search results, used by many search engines would rank pages by how often the search terms occurred in the page, or how strongly associated the search terms were within each resulting page. The PageRank algorithm used by Google, instead analyses human-generated links, assuming that web pages linked from many important pages are themselves likely to be important.

Google algorithm computes a recursive score for pages, based on the weighted sum of the PageRanks of the pages linking to them. PageRank is thought to correlate well with human concepts of importance. In addition to PageRank, Google over the years has added many other secret criteria for determining the ranking of pages on result lists, reported to be over 200 different indicators. The exact percentage of the total of web pages that Google indexes are not known, as it is very hard to actually calculate. Google not only indexes and caches web pages but also takes “snapshots” of other file types, which include PDF, Word documents, Excel spreadsheets, Flash SWF, plain text files, and so on

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Written by Bobby

May 23, 2010 at 4:59 am

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