Extra Virgin Olive Oil is the top of the line, highest grade, and purest olive oil you can get. It's cold pressed, have no added chemicals, and is 100% pure oil pressed from olives. Virgin Olive Oil is a step down. It is still an unadulterated oil, but it may have a few flavor and aroma defects and is slightly less healthy because it has higher free fatty acid levels. Pure Olive Oil or a classic olive oil are basically the leftover oil from the olives that doesn't meet the Extra Virgin Olive Oil standard. It's a much blander olive oil. Light or Extra Light Olive Oil is the lowest grade olive oil you can get. It will have the dullest flavor, has the highest levels of chemicals in it and the fewer nutrients. So don't be fooled by the "light" meaning that it's in some way healthier, it's quite the opposite!