Virgin olive oil is an oil juice obtained by mechanical cold pressing and filtering directly from fresh olive fruits, and there is no chemical treatment during the processing. In other words, olive oil is equivalent to freshly squeezed juice, which is the biggest difference between it and ordinary oil, and also the reason why it can be directly drunk. There is still a lot of olive oil in the olive residue that has been pressed for the first time, which can be extracted by solvent leaching. This "secondary oil" is generally called refined olive oil, but its quality is not as good as that of virgin oil, and the flavor of olive oil is also less. When selecting, we should look at four aspects: first, the acidity value. Generally, regular products will be marked with acid value. The acid value of the best olive oil does not exceed 1%, and the acid value of edible olive oil does not exceed 3.3%. The second is to look for the words "extra virgin" (or "extra virgin"). English is "ExtraVirgin", and what has this word is the best olive oil. The third is to look at the place of origin. The place of origin is one of the important factors that determine the price. The world's major producers of olive oil are concentrated in the Mediterranean coast, among which Spain, Italy and Greece are the world's three major producers and exporters of olive oil. Generally, the quality of olive oil imported from these three countries is better and the price is higher. The fourth is to look at color. Generally, the color of olive oil varies from light yellow to yellow-green. The brighter the olive oil, the better its quality, and the more turbid it is, the worse it is. The virgin olive oil is divided into three grades 1 and FineVirginOliveOil, and the acidity is less than 2%. 2. ExtraVirginOliveOil has the highest quality, and its acidity value does not exceed 1%. 3. OrdinaryVirginOliveOil, with an acidity of no more than 3.3%. RefinedOliveOil is divided into two grades: 1 and refined olive oil, which is extracted from olive oil residue by solvent leaching and refined, and the acidity value can also be controlled at 1.5%.