What is the difference between extra virgin olive oil and 100% pure olive oil?

The main difference between extra virgin olive oil and 100% pure olive oil is the level of acidity. Extra virgin olive oil has a much lower acidity level than 100% pure olive oil, typically ranging from 0.8% to 2%. This means that extra virgin olive oil has a much milder flavor and can be used in higher quality cooking. Additionally, extra virgin olive oil is much more expensive than 100% pure olive oil, due to the additional processing and higher quality of the oil.