Yelp is an American multinational corporation headquartered in San Francisco, California. It develops, hosts and markets Yelp.com and the Yelp mobile app, which publish crowd-sourced reviews about local businesses, as well as the online reservation service Yelp Reservations and online food-delivery service Eat24. The company also trains small businesses in how to respond to reviews, hosts social events for reviewers, and provides data about businesses, including health inspection scores.

Yelp was founded in 2004 by former PayPal employees Russel Simmons and Jeremy Stoppelman. Yelp grew in usage and raised several rounds of funding in the following years. By 2010 it had $30 million in revenue, and the website had published about 4.5 million crowd-sourced reviews. From 2009 to 2012, Yelp expanded throughout Europe and Asia. In 2009, it entered several negotiations with Google for a potential acquisition. Yelp became a public company in March 2012 and became profitable for the first time two years later. As of the fourth quarter of 2017, Yelp reported having a monthly average of 77 million unique visitors via desktop computer and 64 million unique visitors via its mobile website. As of the end of 2017, Yelp said that it had 148 million reviews on its site.