One of the best known, the best and the healthiest is the extra virgin olive oil. It is obtained after the first pressing of healthy olive fruits. Nothing is added to this oil, that means, for example, that extra virgin olive oil with the addition of rosemary is not extra virgin anymore. This oil has to meet strict criteria and must not contain more than 0.8 grams of free fatty acids. Extra virgin olive oil must have an unmistakable smell and taste of  leaves or fruit of the olive.