Yahoo is an American multinational corporation founded by Jerry Yang and David Filo in 1994. The web portal and search engine also provides related services, including Yahoo Directory.
Carol Bartz replaced Yang as CEO in 2009, followed by Tim Morse, Scott Thompson, Ross Levinsohn and Marissa Mayer in July 2012. Yahoo purchased the blogging site Tumblr in May 2013 and social web browser RockMelt in August 2013. In March 2014, Yahoo partnered with Yelp.