An Internet portal offering search, directory listings and a variety of other services. In the past Google has indicated that a link in the Yahoo! Directory can have a beneficial impact on your SEO efforts.
As of August 2011, comScore reports that Yahoo!, whose search results are provided by Bing, has a 11.3% share of the U.S. search market behind Google’s 67.0% share and Microsoft’s (Bing) 17.9%.
Yahoo! is an acronym for “Yet Another Hierarchical Officious Oracle.”
U.S. Search Market Share