Additionally, Google indexes some file types, being able to show users PDFs, Word documents, Excel spreadsheets, PowerPoint presentations, certain Flash multimedia content, and plain text files. For websites that are currently down or otherwise not available, Google provides links to cached versions of the site, formed by the search engine's latest indexing of that page. Google indexes hundreds of terabytes of information from web pages.

4.3 'Hummingbird' search algorithm upgrade.

1.1 'Caffeine' search architecture upgrade.

As of mid-2016, Google's search engine has begun to rely on deep neural networks.

Data about the frequency of use of search terms on Google can be openly inquired via Google Trends and have been shown to correlate with flu outbreaks and unemployment levels, and provide the information faster than traditional reporting methods and surveys. In May 2012, Google introduced a Knowledge Graph semantic search feature in the U.S.Īnalysis of the frequency of search terms may indicate economic, social and health trends. In June 2011, Google introduced ' Google Voice Search' to search for spoken, rather than typed, words. It was originally developed in 1997 by Larry Page, Sergey Brin, and Scott Hassan. The main purpose of Google Search is to search for text in publicly accessible documents offered by web servers, as opposed to other data, such as images or data contained in databases. Google Search also provides many different options for customized searches, using symbols to include, exclude, specify or require certain search behavior, and offers specialized interactive experiences, such as flight status and package tracking, weather forecasts, currency, unit, and time conversions, word definitions, and more. The order of search results returned by Google is based, in part, on a priority rank system called ' PageRank'. It is also the most-visited website in the world. Handling over 3.5 billion searches per day, it has a 92% share of the global search engine market. Google Search (known simply as Google), is a search engine provided by Google.

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