Yelp Reservations is a convenient and easy-to-use online reservation system that allows you to book tables at restaurants, bars, and other establishments. With Yelp Reservations, you can quickly and easily find available tables, view menus, and make reservations with just a few clicks
From Wikipedia
Yelp Inc. is an American company that develops the Yelp.com website and the Yelp mobile app, which publishes crowd-sourced reviews about businesses. It also operates Yelp Guest Manager, a table reservation service. It is headquartered in San Francisco.