Web search engine !

Google !

Google Web Search is a web search engine owned by Google Inc. Google Search is the most-used search engine on the World Wide Web,3-receiving several hundred million queries each day through its various services.

4-The order of search results 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, using Boolean operators such as: exclusion ("-xx"), alternatives ("xx OR yy"), and wildcard ("x * x").

5-The main purpose of Google Search is to hunt for text in Web pages, as opposed to other data, such as with Google Image Search. Google Search was originally developed by Larry Page and Sergey Brin in 1997.

6- Google Search provides at least 22 special features beyond the original word-search capability.

7- These include synonyms, weather forecasts, time zones, stock quotes, maps, earthquake data, movie showtimes, airports, home listings, and sports scores. There are special features for numbers, including ranges (70..73),[8] prices, temperatures, money/unit conversions ("10.5 cm in inches"), calculations ("3*4+sqrt(6)-pi/2"), package tracking, patents, area codes,

7 and language translation of displayed pages. In June 2011, Google introduced "Google Voice Search" and "Search by Image" features for allowing the users to search words by speaking and by giving images.

9-The frequency of use of many search terms have reached a volume that they may indicate broader economic, social and health trends.

10- Data about the frequency of use of search terms on Google (available through Google Adwords, Google Trends, and Google Insights for Search) have been shown to correlate with flu outbreaks and unemployment levels and provide the information faster than traditional reporting methods and government surveys.

Yahoo! Inc.

(NASDAQ: YHOO) is an American multinational internet corporation headquartered in Sunnyvale, California, United States. The company is perhaps best known for its web portal, search engine (Yahoo! Search), Yahoo! Directory, Yahoo! Mail, Yahoo! News, advertising, online mapping (Yahoo! Maps), video sharing (Yahoo! Video), and social media websites and services. It is one of the largest websites in the United States.

2-Yahoo! inclusive was founded by Jerry Yang and David Filo in January 1994 and was incorporated on March 1, 1995. On January 13, 2009, Yahoo! appointed Carol Bartz, former executive chairman of Autodesk, as its new chief executive officer and a member of the board of directors.

3- On September 6, 2011, Bartz was removed from her position at Yahoo! by chairman Roy Bostock, over the phone; and CFO Tim Morse was named as Interim CEO of the company.4-

5-In January 1994, Jerry Yang and David Filo were electrical engineering graduate students at Stanford University when they created a website named "David and Jerry's Guide to the World Wide Web".

7- David and Jerry's Guide to the World Wide Web was a directory of other websites, organized in a hierarchy, as opposed to a searchable index of pages. In April 1994, "David and Jerry's Guide to the World Wide Web" was renamed "Yahoo!".

9-The yahoo.com domain was created on January 18, 1995.

10- The word is an acronym for "Yet Another Hierarchical Officious Oracle."

11- The term "hierarchical" described how the Yahoo! database was arranged in directory layers. The term "oracle" was intended to mean "source of truth and wisdom," and "officious" described the many office workers who would use the Yahoo! database while surfing from work.

12-However, Filo and Yang insist they mainly selected the name because they liked the slang definition of a "yahoo" (used by college students in David Filo's native Louisiana in the late 1980s and early 1990s to refer to an unsophisticated, rural Southerner): "rude, unsophisticated, uncouth." Filo's college girlfriend often referred to Filo as a "yahoo." "Yahoo" also stems from the name of a fictional being from Gulliver's Travels.

Bing

(formerly Live Search, Windows Live Search, and MSN Search) is a web search engine (advertised as a "decision engine") from Microsoft. Bing was unveiled by Microsoft CEO Steve Ballmer on May 28, 2009 at the All Things Digital conference in San Diego. It went fully online on June 3, 2009, with a preview version released on June 1, 2009.

Notable changes include the listing of search suggestions as queries are entered and a list of related searches (called "Explore pane") based on semantic technology from Powerset that Microsoft purchased in 2008.

On July 29, 2009, Microsoft and Yahoo! announced a deal in which Bing would power Yahoo! Search. All Yahoo! Search global customers and partners are expected to have made the transition by early 2012.

In October 2011, Bing announced it is working on new back-end search infrastructure, with the goal of delivering faster and more relevant search results for users. Known as “Tiger,” the new index-serving technology is being incorporated into Bing globally starting in August 2011.