In agriculture, olive oil is an oil extracted from the fruit of the European olive tree (Olea europaea L.), which originated in the Mediterranean area. It is used in cooking, cosmetics, and soaps. Olive oil is regarded as a healthy dietary oil because of its high content of monounsaturated fat. It was also known as Lucca crown in the 19th century; an example of its usage is found in Sydney Smith's salad dressing.