Search results

The exact percentage of the total of web pages that Google indexes is 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.^[12] Except in the case of text and SWF files, the cached version is a conversion to (X)HTML, allowing those without the corresponding viewer application to read the file.

Users can customize the search engine, by setting a default language, using the "SafeSearch" filtering technology and set the number of results shown on each page. Google has been criticized for placing long-term cookies on users' machines to store these preferences, a tactic which also enables them to track a user's search terms and retain the data for more than a year. For any query, up to the first 1000 results can be shown with a maximum of 100 displayed per page.

PageRank

Google's rise to success was in large part due to a patented algorithm called PageRank that helps rank web pages that match a given search string.^[9] Previous keyword-based methods of ranking search results, used by many search engines that were once more popular than Google, 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 instead analyses human-generated links, assuming that web pages linked from many important pages are themselves likely to be important. The 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.^[10][11] The details are kept secret due to spammers and in order to maintain an advantage over Google's competitors.

what is google.com

Google.com is a best search engine in this world today

Google Search or Google Web Search is a web search engine owned by Google Inc. and is the most-used search engine on the Web.^[3] Google receives several hundred million queries each day through its various services.^[4] The main purpose of Google Search is to hunt for text in webpages, as opposed to other data, such as with Google Image Search. Google search was originally developed by Larry Page and Sergey Brin in 1997.^[5]

Google Search provides more than 22 special features beyond the original word-search capability.^[6] These include synonyms, weather forecasts, time zones, stock quotes, maps, earthquake data, movie showtimes, airports, home listings, and sports scores. (see below:Special features ). There are special features for numbers, including ranges (70..73),^[7] prices, temperatures, money/unit conversions ("10.5 cm in inches"), calculations ( 3*4+sqrt(6)-pi/2 ), package tracking, patents, area codes,^[6] and rudimentary language translation of displayed pages.

The order of search results on Google's search-results pages is based on a priority rank called a "PageRank". Google Search provides many options for customized search