Olive oil is a type of oil that is made from the fruit of olive trees. It is commonly used in cooking, particularly in Mediterranean and Middle Eastern cuisine. Olive oil is high in monounsaturated fats, which are considered to be healthy fats. It is also a good source of antioxidants, including vitamin E and polyphenols. There are several types of olive oil, including extra-virgin olive oil, which is made from the first cold pressing of olives and is considered to be the highest quality. Virgin olive oil is made from the second pressing of the olives, and is of slightly lower quality. Olive oil is generally considered to be a healthy choice for cooking, as it has a relatively low smoke point and is stable when heated. It is also widely available and relatively inexpensive. Some people may be allergic to olive oil, so it is always a good idea to check with a doctor or allergist before using it.