Google Search

Google Search

The Google homepage
URL	http://www.google.com list of domain names https://www.google.com
Commercial?	Yes
Type of site	Search Engine
Registration	Optional
Available language(s)	Multilingual (124)
Owner	Google
Created by	Sergey Brin and Larry Page
Launched	September 15, 1997[1]
Alexa rank	▬ 1 (July 2010[update])[2]
Revenue	From AdWords
Current status	Active

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 at least 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 language translation of displayed pages.

The order of search results (ghits for Google hits) on Google's search-results pages is based, in part, on a priority rank called a "PageRank". Google Search provides many options for customized search (see below: Search options), using Boolean operators such as: exclusion ("-xx"), inclusion ("+xx"), alternatives ("xx OR yy"), and wildcard ("x * x").^[8]

Contents 1 Search engine 1.1 PageRank 1.2 Search results 1.3 Non-indexable data 1.4 Google optimization 2 Functionality 2.1 Search syntax 2.2 Query expansion 2.3 "I'm Feeling Lucky" 2.4 Rich Snippets 2.5 Special features 2.6 Search options 2.7 Error messages 2.7.1 January 2009 malware bug 2.8 Doodle for Google 2.9 Google Caffeine 2.10 Encrypted Search 3 Instant Search 3.1 Censorship 4 International 4.1 Languages 4.2 Domain names 5 Search products 6 Energy consumption 7 See also 8 References 9 Further reading 10 External links

[edit] Search engine

[edit] 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.

[edit] 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. The ability to specify the number of results is available only if "Instant Search" is not enabled. If "Instant Search" is enabled, only 10 results are displayed, regardless of this setting.

[edit] Non-indexable data

Despite its immense index, there is also a considerable amount of data available in online databases which are accessible by means of queries but not by links. This so-called invisible or deep Web is minimally covered by Google and other search engines.^[13] The deep Web contains library catalogs, official legislative documents of governments, phone books, and other content which is dynamically prepared to respond to a query.

Privacy in some countries forbids the showing of some links. For instance in Switzerland any individual can force Google Inc. to delete a link which contains their name.^{[citation needed]}

[edit] Google optimization

Since Google is the most popular search engine, many webmasters have become eager to influence their website's Google rankings. An industry of consultants has arisen to help websites increase their rankings on Google and on other search engines. This field, called search engine optimization, attempts to discern patterns in search engine listings, and then develop a methodology for improving rankings to draw more searchers to their client's sites.

Search engine optimization encompasses both "on page" factors (like body copy, title elements, H1 heading elements and image alt attribute values) and Off Page Optimization factors (like anchor text and PageRank). The general idea is to affect Google's relevance algorithm by incorporating the keywords being targeted in various places "on page", in particular the title element and the body copy (note: the higher up in the page, presumably the better its keyword prominence and thus the ranking). Too many occurrences of the keyword, however, cause the page to look suspect to Google's spam checking algorithms.

Google has published guidelines for website owners who would like to raise their rankings when using legitimate optimization consultants.^[14]

[edit] Functionality

Google search consists of a series of localized websites. The largest of those, the google.com site, is the top most-visited website in the world.^[15] Some of its features include a definition link for most searches including dictionary words, the number of results you got on your search, links to other searches (e.g. for words that Google believes to be misspelled, it provides a link to the search results using its proposed spelling), and many more.

[edit] Search syntax

Google's search engine normally accepts queries as a simple text, and breaks up the user's text into a sequence of search terms, which will usually be words that are to occur in the results, but one can also use Boolean operators, such as: quotations marks (") for a phrase, a prefix such as "+", "-" for qualified terms, or one of several advanced operators, such as "site:". The webpages of "Google Search Basics" describe each of these additional queries and options (see below: Search options).

Google's Advanced Search web form gives several additional fields which may be used to qualify searches by such criteria as date of first retrieval. All advanced queries transform to regular queries, usually with additional qualified terms.

[edit] Query expansion

Google applies query expansion to the submitted search query, transforming it into the query that will actually be used to retrieve results. As with page ranking, the exact details of the algorithm Google uses are deliberately obscure, but certainly the following transformations are among those that occur:

• Term reordering: in information retrieval this is a standard technique to reduce the work involved in retrieving results. This transformation is invisible to the user, since the results ordering uses the original query order to determine relevance.
• Stemming is used to increase search quality by keeping small syntactic variants of search terms.^[16]
• There is a limited facility to fix possible misspellings in queries.

[edit] "I'm Feeling Lucky"

Google's homepage includes a button labeled "I'm Feeling Lucky". When a user clicks on the button the user will be taken directly to the first search result, bypassing the search engine results page. The thought is that if a user is "feeling lucky", the search engine will return the perfect match the first time without having to page through the search results. According to a study by Tom Chavez of "Rapt", this feature costs Google $110 million a year as 1% of all searches use this feature and bypass all advertising.^[17]

On October 30, 2009, for some users, the "I'm Feeling Lucky" button was removed from Google's main page, along with the regular search button. Both buttons were replaced with a field that reads, "This space intentionally left blank." This text faded out when the mouse was moved on the page, and normal search functionality is achieved by filling in the search field with the desired terms and pressing enter. A Google spokesperson explains, "This is just a test, and a way for us to gauge whether our users will like an even simpler search interface."^[18] Personalized Google homepages retained both buttons and their normal functions.

On May 21, 2010, the 30th anniversary of Pac-Man, the "I'm Feeling Lucky" button was replaced with a button reading the words "Insert Coin". After pressing the button, the user would begin a Google-themed game of Pac-Man in the area where the Google logo would normally be. Pressing the button a second time would begin a two-player version of the same game that includes Ms. Pacman for player 2. This version can be accessed at http://www.google.com/pacman as a permanent link to the page.

[edit] Rich Snippets

On 12 May 2009, Google announced that they would be parsing the hCard, hReview, and hProduct microformats and using them to populate search result pages with what they called "Rich Snippets".^[19]

[edit] Special features

Besides the main search-engine feature of searching for text, Google Search has more than 22 "special features" (activated by entering any of dozens of trigger words) when searching:^[6][7][20]

• weather – The weather conditions, temperature, wind, humidity, and forecast,^[6] for many cities, can be viewed by typing "weather" along with a city for larger cities or city and state, U.S. zip code, or city and country for smaller cities (such as: weather Lawrence, Kansas; weather Paris; weather Bremen, Germany).
• stock quotes – The market data^[6] for a specific company or fund can be viewed, by typing the ticker symbol (or include "stock"), such as: CSCO; MSFT; IBM stock; F stock (lists Ford Motor Co.); or AIVSX (fund). Results show inter-day changes, or 5-year graph, etc. This does not work for stock names which are one letter long, such as Citigroup (C) or Macy's (M) (Ford being an exception), or are common words, such as Diamond Offshore (DO) or Majesco (COOL).
• time – The current time in many cities (worldwide),^[6] can be viewed by typing "time" and the name of the city (such as: time Cairo; time Pratt, KS).
• sports scores – The scores and schedules, for sports teams,^[6] can be displayed by typing the team name or league name into the search box.
• unit conversion – Measurements can be converted,^[6] by entering each phrase, such as: 10.5 cm in inches; or 90 km in miles
• currency conversion – A money or currency converter can be selected,^[6] by typing the names or currency codes (listed by ISO 4217): 6789 Euro in USD; 150 GBP in USD; 5000 Yen in USD; 5000 Yuan in lira (the U.S. dollar can be USD or "US$" or "$", while Canadian is CAD, etc.).
• calculator – Calculation results can be determined,^[6] as calculated live, by entering a formula in numbers or words, such as: 6*77 +pi +sqrt(e^3)/888 plus 0.45. The user is given the option to search for the formula, after calculation. The calculator also uses the unit and currency conversion functions to allow unit-aware calculations. For example, "(3 EUR/liter) / (40 miles/gallon) in USD / mile" calculates the dollar cost per mile for a 40 mpg car with gas costing 3 euros a liter. The caret "^" raises a number to an exponent power, and percentages are allowed ("40% of 300").^[7]
• numeric ranges – A set of numbers can be matched by using a double-dot between range numbers (70..73 or 90..100) to match any positive number in the range, inclusive.^[7] Negative numbers are treated as using exclusion-dash to not match the number.
• dictionary lookup – A definition for a word or phrase can be found,^[6] by entering "define" followed by a colon and the word(s) to lookup (such as, "define:philosophy")
• maps – Some related maps can be displayed,^[6] by typing in the name or U.S. ZIP code of a location and the word "map" (such as: New York map; Kansas map; or Paris map).
• movie showtimes – Reviews or film showtimes can be listed for any movies playing nearby,^[6] by typing "movies" or the name of any current film into the search box. If a specific location was saved on a previous search, the top search result will display showtimes for nearby theaters for that movie. These listings however are sometimes totally incorrect and there is no way to ask Google to correct them; for example, on 25 July, for the El Capitan Theatre, google showtimes lists Up but according to the El Capitan website, the only movie playing that day is G-Force.^{[citation needed]}
• public data – Trends for population (or unemployment rates)^[6] can be found for U.S. states & counties, by typing "population" or "unemployment rate" followed by a state or county name.
• real estate and housing – Home listings in a given area can be displayed,^[6] using the trigger words "housing", "home", or "real estate" followed by the name of a city or U.S. zip code.
• travel data/airports – The flight status for arriving or departing U.S. flights can be displayed,^[6] by typing in the name of the airline and the flight number into the search box (such as: American airlines 18). Delays at a specific airport can also be viewed (by typing the name of the city or three-letter airport code plus word "airport").
• package tracking – Package mail can be tracked^[6] by typing the tracking number of a Royal Mail, UPS, FedEx or USPS package directly into the search box. Results will include quick links to track the status of each shipment.
• patent numbers – U.S. patents can be searched^[6][20] by entering the word "patent" followed by the patent number into the search box (such as: Patent 5123123).
• area code – The geographical location (for any U.S. telephone area code)^[6] can be displayed by typing a 3-digit area code (such as: 650).
• synonym search – A search can match words similar to those specified,^[6] by placing the tilde sign (~) immediately in front of a search term, such as:  ~fast food.
• U.S. Government search – Searching of U.S. government websites can be performed from webpage: www.google.com/unclesam.^[20]

[edit] Search options

The webpages maintained by the Google Help Center have text describing more than 15 various search options.^[21] The Google operators:

• OR – Search for either one, such as "price high OR low" searches for "price" with "high" or "low".
• "-" – Search while excluding a word, such as "apple -tree" searches where word "tree" is not used.
• "+" – Force inclusion of a word, such as "Name +of +the Game" to require the words "of" & "the" to appear on a matching page.
• "*" – Wildcard operator to match any words between other specific words.

Some of the query options are as follows:

• define: – The query prefix "define:" will provide a definition^[21] of the words listed after it.
• stocks: – After "stocks:" the query terms are treated as stock ticker symbols^[21] for lookup.
• site: – Restrict the results to those websites in the given domain,^[21] such as, site:www.acmeacme.com. The option "site:com" will search all domain URLs named with ".com" (no space after "site:").
• allintitle: – Only the page titles are searched^[21] (not the remaining text on each webpage).
• intitle: – Prefix to search in a webpage title,^[21] such as "intitle:google search" will list pages with word "google" in title, and word "search" anywhere (no space after "intitle:").
• allinurl: – Only the page URL address lines are searched^[21] (not the text inside each webpage).
• inurl: – Prefix for each word to be found in the URL;^[21] others words are matched anywhere, such as "inurl:acme search" matches "acme" in a URL, but matches "search" anywhere (no space after "inurl:").

The page-display options (or query types) are:

• cache: – Highlights the search-words within the cached document, such as "cache:www.google.com xxx" shows cached content with word "xxx" highlighted.
• link: – The prefix "link:" will list webpages that have links to the specified webpage, such as "link:www.google.com" lists webpages linking to the Google homepage.
• related: – The prefix "related:" will list webpages that are "similar" to a specified web page.
• info: – The prefix "info:" will display some background information about one specified webpage, such as, info:www.google.com. Typically, the info is the first text (160 bytes, about 23 words) contained in the page, displayed in the style of a results entry (for just the 1 page as matching the search).
• filetype: - results will only show files of the desired type (ex filetype:pdf will return pdf files)

Note that Google searches the HTML coding inside a webpage, not the screen appearance: the words displayed on a screen might not be listed in the same order in the HTML coding.

[edit] Error messages

Some searches will give a 403 Forbidden error with the text

"We're sorry... ... but your query looks similar to automated requests from a computer virus or spyware application. To protect our users, we can't process your request right now. We'll restore your access as quickly as possible, so try again soon. In the meantime, if you suspect that your computer or network has been infected, you might want to run a virus checker or spyware remover to make sure that your systems are free of viruses and other spurious software. We apologize for the inconvenience, and hope we'll see you again on Google."

sometimes followed by a CAPTCHA prompt.^[22]

The screen was first reported in 2005, and was a response to the heavy use of Google by search engine optimization companies to check on ranks of sites they were optimizing. The message is triggered by high volumes of requests from a single IP address. Google apparently uses the Google cookie as part of its determination of refusing service.^[22]

In June 2009, after the death of pop superstar Michael Jackson, this message appeared to many internet users who were searching Google for news stories related to the singer, and was assumed by Google to be a DDoS attack, although many queries were submitted by legitimate searchers.

[edit] January 2009 malware bug

Google flags search results with the message "This site may harm your computer" if the site is known to install malicious software in the background or otherwise surreptitiously. Google does this to protect users against visiting sites that could harm their computers. For approximately 40 minutes on January 31, 2009, all search results were mistakenly classified as malware and could therefore not be clicked; instead a warning message was displayed and the user was required to enter the requested URL manually. The bug was caused by human error.^{[23][24][25][26]} The URL of "/" (which expands to all URLs) was mistakenly added to the malware patterns file.^[24][25]

[edit] Doodle for Google

On certain occasions, the logo on Google's webpage will change to a special version, known as a "Google Doodle". Clicking on the Doodle links to a string of Google search results about the topic. The first was a reference to the Burning Man Festival in 1998,^[27][28] and others have been produced for the birthdays of notable people like Albert Einstein, historical events like the interlocking Lego block's 50th anniversary and holidays like Valentine's Day.^[29]

[edit] Google Caffeine

In August 2009, Google announced the rollout of a new search architecture, codenamed "Caffeine".^[30] The new architecture was designed to return results faster and to better deal with rapidly updated information^[31] from services including Facebook and Twitter.^[30] Google developers noted that most users would notice little immediate change, but invited developers to test the new search in its sandbox.^[32] Differences noted for their impact upon search engine optimization included heavier keyword weighting and the importance of the domain's age.^[33][34] The move was interpreted in some quarters as a response to Microsoft's recent release of an upgraded version of its own search service, renamed Bing.^[35] Google announced completion of Caffeine on 8 June 2010, claiming 50% fresher results due to continuous updating of its index.^[36] With Caffeine, Google moved its back-end indexing system away from MapReduce and onto BigTable, the company's distributed database platform.^[37] Caffeine is also based on Colossus, or GFS2,^[38] an overhaul of the GFS distributed file system.^[39]

[edit] Encrypted Search

In May 2010 Google rolled out SSL-encrypted web search.^[40] The encrypted search can be accessed at: https://encrypted.google.com

[edit] Instant Search

Google Instant, an enhancement that displays suggested results while the user types, was introduced in the United States starting on September 8, 2010. One concern is that people will select one of the suggested results instead of finishing their request, and that such a practice could cause bias toward familiar businesses or other search terms. Pornographic or otherwise offensive search terms are excluded from the suggested results. The instant feature appears only on the basic Google site and not specialized iGoogle pages. Google expects Google Instant to save users 2 to 5 seconds in every search, which they say will be collectively 11 million seconds per hour.^[41] Search engine marketing pundits speculate that Google Instant will have a great impact on local and paid search. ^[42]

In concert with the Google Instant launch, Google disabled the ability of users to choose to see more than 10 search results per page. Instant Search can be disabled via Google's "preferences" menu, but autocomplete-style search suggestions now cannot be disabled. A Google representative stated, "It's in keeping with our vision of a unified Google search experience to make popular, useful features part of the default experience, rather than maintain different versions of Google. As Autocomplete quality has improved, we felt it was appropriate to have it always on for all of our users."^[43]

[edit] Censorship

The publication 2600: The Hacker Quarterly has compiled a list of words that are restricted by Google Instant.^[44] These are terms the web giant's new instant search feature will not search. ^[45][46]

[edit] International

Google is available in many languages and has been localized for many countries.^[47]

[edit] Languages

Afrikaans Akan Albanian Amharic Arabic Armenian Azerbaijani Basque Belarusian Bengali Bihari Bosnian Breton Bulgarian Cambodian (Khmer) Catalan Chinese (Simplified) Chinese (Traditional) Corsican Croatian Czech Danish

Dutch English (United Kingdom) English (United States) Esperanto Estonian Faroese Filipino Finnish French Frisian (West) Galician Georgian German Greek Guarani Gujarati Hausa Haitian Creole Hawaiian Hebrew Hindi Hungarian

Icelandic Igbo Indonesian Interlingua Irish Italian Japanese Javanese Kannada Kazakh Kinyarwanda Kirundi Korean Kurdish Kyrgyz Laothian Latin Latvian Lingala Lithuanian Luganda Luo

Macedonian Malagasy Malay Malayalam Maltese Māori Marathi Mauritian Creole Moldavian (Romanian) Mongolian Montenegrin Nepali Norwegian Norwegian (Nynorsk) Occitan Oriya Oromo Pashto Persian Polish Portuguese (Brazil) Portuguese (Portugal)

Punjabi Quechua Romanian Romansh Runyakitara Russian Scots Gaelic Serbian Serbo-Croatian Sesotho Setswana Shona Sindhi Sinhalese Slovak Slovene Somali Spanish Sundanese Swahili Swedish Tajik

Tamil Tatar Telugu Thai Tigrinya Tonga Turkish Turkmen Twi Uighur Ukrainian Urdu Uzbek Vietnamese Welsh Xhosa Yiddish Yoruba Zulu

The interface has also been made available in some languages for humorous purpose:

• Elmer Fudd
• Hacker
• Klingon
• Pig Latin
• Bork, bork, bork!
• Pirate

[edit] Domain names

In addition to the main URL Google.com (http://www.google.ch Google.ch), Google Inc. owns 160 domain names for each of the countries/regions in which it has been localized.^[47] As Google is an American company, the main domain name can be considered as the U.S. one. For a list of the current domain names, see Template:Google.com.

Some domain names unregistered by Google are currently squatted, such as "Google.ua" (for Ukraine, where the correct URL is "google.com.ua").

[edit] Search products

In addition to its tool for searching webpages, Google also provides services for searching images, Usenet newsgroups, news websites, videos, searching by locality, maps, and items for sale online. In 2006, Google has indexed over 25 billion web pages,^[48] 400 million queries per day,^[48] 1.3 billion images, and over one billion Usenet messages. It also caches much of the content that it indexes. Google operates other tools and services including Google News, Google Suggest, Google Product Search, Google Maps, Google Co-op, Google Earth, Google Docs, Picasa, Panoramio, YouTube, Google Translate, Google Blog Search and Google Desktop Search.

There are also products available from Google that are not directly search-related. Gmail, for example, is a webmail application, but still includes search features; Google Browser Sync does not offer any search facilities, although it aims to organize your browsing time.

Also Google starts many new beta products, like Google Social Search or Google Image Swirl.

[edit] Energy consumption

Google claims that a search query requires altogether about 1 kJ or 0.0003 kW·h.^[49]

[edit] See also

• Google search features
• Googlewhack
• Goojje
• History of Google
• List of Google products
• List of search engines

[edit] References

[edit] Further reading

• Google Hacks from O'Reilly is a book containing tips about using Google effectively. Now in its third edition. ISBN 0-596-52706-3.
• Google: The Missing Manual by Sarah Milstein and Rael Dornfest (O'Reilly, 2004). ISBN 0-596-00613-6
• How to Do Everything with Google by Fritz Schneider, Nancy Blachman, and Eric Fredricksen (McGraw-Hill Osborne Media, 2003). ISBN 0-07-223174-2
• Google Power by Chris Sherman (McGraw-Hill Osborne Media, 2005). ISBN 0-07-225787-3
• Barroso, Luiz Andre; Dean, Jeffrey; Hölzle, Urs (2003). "Web Search for a Planet: The Google Cluster Architecture". IEEE Micro 23 (2): 22–28. doi:10.1109/MM.2003.1196112. 

[edit] External links

• Google.com

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