Yahoo! (specifically Yahoo! Search) is one of the oldest search engines on the Internet. It was founded in 1995. Currently, as of 2016, Yahoo!Search ranks as the third most popular search engine, with about 12% of the market share, following Google (65%) and Bing (20%).

Most marketers do not make a concentrated effort to satisfy Yahoo! Search in the way that they do Google’s algorithm or Bing.

For website owners, Yahoo! does have many important services which deserve attention, such as Yahoo! Directory, Yahoo! content channels, Yahoo! Mail, and Yahoo! Shopping.