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 SeatMe 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 quickly and raised several rounds of funding. By 2010 it had $30 million in revenues and the website had published more than 4.5 million crowd-sourced reviews. From 2009–2012, 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 2016, Yelp.com has 135 million monthly visitors and 95 million reviews. The company's revenues come from businesses advertising.

Yelp is an Internet search and review service.

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A bark is a sound most commonly produced by dogs. Other animals that make this noise include wolves, coyotes, pinnipeds, foxes and quolls. Woof is the most common representation in the English language for this sound, especially for large dogs. Other transliterations include the onomatopoeic ruff, arf, au au, bow-wow, and, for small dogs, yip. “Bark” is also a verb that describes the sharp explosive cry of certain animals.

In dogs

Dog barking is distinct from wolf barking. Wolf barks represent only 2.3% of all wolf vocalizations and are described as “rare” occurrences. According to Schassburger, wolves bark only in warning, defense, and protest. In contrast, dogs bark in a wide variety of social situations, with acoustic communication in dogs being described as hypertrophic. Additionally, while wolf barks tend to be brief and isolated, adult dogs bark in long, rhythmic stanzas. Dogs have been known to bark for hours on end.

While a distinct reason for the difference is unknown, a strong hypothesis is that the vocal communication of dogs developed due to their domestication. As evidenced by the farm-fox experiment, the process of domestication alters a breed in more ways than just tameness. Domesticated breeds show vast physical differences from their wild counterparts, notably an evolution that suggests neoteny, or the retention of juvenile characteristics in adults. Adult dogs have, for example large heads, floppy ears, and shortened snouts – all characteristics seen in wolf puppies. The behavior, too, of adult dogs shows puppy-like characteristics: dogs are submissive, they whine, and they frequently bark. The experiment illustrates how selecting for one trait (in this case, tameness) can create profound by-products, both physical and behavioral.