Top 10 Global search engine

A web search engine is a software system that is designed to search for information on the World Wide Web. The search results are generally presented in a line of results often referred to as search engine results pages (SERPs). The information may be a mix of web pages, images, and other types of files. Some search engines also mine data available in databases or open directories. Unlike web directories, which are maintained only by human editors, search engines also maintain real-time information by running an algorithm on a web crawler.

Top10 Global search engine

1. Google (1.8 billion visitors/month)
   Google Search, commonly referred to as Google Web Search or simply Google, is a web search engine developed by Google. It is the most-used search engine on the World Wide Web,^[5] handling more than three billion searches each day.^[6][7] As of February 2016, it is the most used search engine in the US with 64.0% market share.^[8]The order of search on Google’s search-results pages is based, in part, on a priority rank called a “PageRank“. Google Search provides many different options for customized search, using Boolean operators such as exclusion (“-xx”), alternatives (“xx OR yy OR zz”), and wildcards(“Winston * Churchill” returns “Winston Churchill”, “Winston Spencer Churchill”, etc.).^[9] The same and other options can be specified in a different way on an Advanced Search page.
2. Bing (500 million visitors/month)
   Bing is a web search engine owned and operated by Microsoft. The service has its origins in Microsoft’s previous search engines: MSN Search, Windows Live Search and later Live Search. Bing provides a variety of search services, including web, video, image and map search products. It is developed using ASP.NET.Bing, Microsoft’s replacement for Live Search, was unveiled by Microsoft CEO Steve Ballmer on May 28, 2009, at the All Things Digitalconference in San Diego, California, for release on June 1, 2009.^[3] Notable new features at the time included the listing of search suggestions while queries are entered and a list of related searches (called “Explore pane”) based on semantic technology from Powerset,^[4]which Microsoft had acquired in 2008.^[5]
3. Yahoo (490 million visitors/month)
   Yahoo! Search is a web search engine owned by Yahoo, headquartered in Sunnyvale, California^[3]. As of February 2015 it is the third largest search engine in the US by the query volume at 12.8%, after its competitors Google at 64.5% and Bing at 19.8%.^[4]Originally, “Yahoo Search” referred to a Yahoo-provided interface that sent queries to a searchable index of pages supplemented with its directory of websites. The results were presented to the user under the Yahoo! brand. Originally, none of the actual web crawling and data housing was done by Yahoo! itself. In 2001, the searchable index was powered by Inktomi and later was powered by Google until 2004, when Yahoo! Search became independent. On July 29, 2009, Microsoft and Yahoo! announced a deal in which Bing would henceforth power Yahoo! Search.
4. Baidu (480 million visitors/month)a Chinese search engine for websites, audio files and images.
5. Ask (300 million visitors/month)
   
   Ask.com (originally known as Ask Jeeves) is a question answering-focused e-business and web search engine founded in 1996 by Garrett Gruener and David Warthen in Berkeley, California.The original software was implemented by Gary Chevsky from his own design. Warthen, Chevsky, Justin Grant, and others built the early AskJeeves.com website around that core engine. In late 2010, facing insurmountable competition from more popular search engines, the company outsourced its web search technology and returned to its roots as a question and answer site.^[2] Douglas Leeds was elevated from president to CEO in 2010.
6. Aol (200 millions visitors/month)
   AOL (formerly a company known as AOL Inc., originally known as America Online, and stylized as Aol) is a web portal and online service provider based in New York. It is a brand marketed by Oath, a subsidiary of Verizon Communications. AOL was one of the early pioneers of the Internet in the mid-1990s, and the most recognized brand on the web in the U.S. It originally provided a dial-up service to millions of Americans, as well as providing a web portal, e-mail, instant messaging and later a web browser following its purchase of Netscape. At the height of its popularity, it purchased the media conglomerate Time Warner in the largest merger in U.S. history. AOL rapidly declined thereafter, partly due to the decline of dial-up to broadband.^[2] AOL was eventually spun off from Time Warner in 2009, with Tim Armstrong appointed the new CEO. Under his leadership, the company invested in media brands and advertising technologies.
7. DuckDuckGo (150 million visitors/month)DuckDuckGo (DDG) is an Internet search engine that emphasizes protecting searchers’ privacy and avoiding the filter bubble of personalized search results.^[3] DuckDuckGo distinguishes itself from other search engines by not profiling its users and by deliberately showing all users the same search results for a given search term.^[5] DuckDuckGo emphasizes returning the best results, rather than the most results, and generates those results from over 400 individual sources, including key crowdsourced sites such as Wikipedia, and other search engines like Bing, Yahoo!, Yandex, and Yummly.
8. WolframAlpha (35 millions visitors/month)
   Wolfram Alpha (also styled WolframAlpha and Wolfram|Alpha) is a computational knowledge engine^[5] or answer engine developed by Wolfram Research, which was founded by Stephen Wolfram. It is an online service that answers factual queries directly by computing the answer from externally sourced “curated data”,^[6] rather than providing a list of documents or web pages that might contain the answer as a search enginemight.^[7]Wolfram Alpha, which was released on May 18, 2009, is based on Wolfram’s earlier flagship product Wolfram Mathematica, a computational platform or toolkit that encompasses computer algebra, symbolic and numerical computation, visualization, and statistics capabilities.^[3] Additional data is gathered from both academic and commercial websites such as the CIA’s The World Factbook, the United States Geological Survey, a Cornell University Library publication called All About Birds, Chambers Biographical Dictionary, Dow Jones, the Catalogue of Life,^[5]CrunchBase,^[8] Best Buy,^[9] the FAA^[10] and optionally a user’s Facebook account.
9. Yandex ( 7.7 millions visitors/month)
   Yandex Search is a web search engine owned by Russian corporation Yandex. It is the core product of Yandex. In January 2015 Yandex Search generated 51.2% of all search traffic in Russia according to Liveinternet.
10. WebCrawler (4.7 millions visitors/month)WebCrawler is a metasearch engine that blends the top search results from Google Search and Yahoo! Search. WebCrawler also provides users the option to search for images, audio, video, news, yellow pages and white pages. WebCrawler is a registered trademark of InfoSpace, Inc. It went live on April 20, 1994 and was created by Brian Pinkerton at the University of Washington.

Reference: Wikipedia