Olive oil is oil obtained from the fruits of olive trees. Earlier, olive oil was obtained by crushing olive fruits between stone rollers. The mashed olive pulp was then squeezed between cloth mats and the oil was filtered. However in modern times, the process is mechanised by using large grinders, hydraulic presses and advanced filtrating agents. Olive oil is used for cooking, in preparation of cosmetics and in pharmaceutical industries. It is also used as fuel in traditional oil lamps. Recently, it has gained popularity due to its health benefits. Health experts say that consumption of olive oil reduces the risk of heart disease, stroke, depression and breast cancer. Greece is the world’s third largest producer of olive oil and the world’s largest exporter of extra virgin olive oil.