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Yahoo! Search is a web search engine, owned by Yahoo! Inc. and was as of December 2009, the 2nd largest search engine on the web by query volume, at 6.29%, after its competitor Google at 85.35% and before Bing at 3.27%, according to Net Applications.

Originally, Yahoo! Search started as a web directory of other websites, organized in a hierarchy, as opposed to a searchable index of pages. In the late 1990s, Yahoo! evolved into a full-fledged portal with a search interface and, by 2007, a limited version of selection-based search.