Launched by Microsoft in 2009, Bing is the second largest web search engine with 17.9 percent share of the U.S. market*. In addition, Bing also powers Yahoo!’s search function (11.3% of U.S. market).
Prior to being relaunched as Bing, the service was known variously as Live Search, Windows Live Search and MSN Search.
*comScore U.S. analysis, April 2013
U.S. Search Market Share