OpenTable provides a restaurant management system for restaurateurs called the ERB (Electronic Reservation Book). In addition, the company operates OpenTable.com, a website for making restaurant reservations online. The website initially launched in the San Francisco area in 1999. Since then OpenTable has grown to have a customer base of over 30,000 restaurants in the U.S., Canada, Germany, Japan, Mexico and the UK. More than 530 million diners have been seated via OpenTable.