The difference between extra virgin olive oil and regular or “pure” olive oil lies in the process used to extract the oil from the olives, which affects both the flavor and smoke point of the oil.
Extra virgin olive oil is unrefined, which means that it is made by cold pressing olives to extract the oil. No heat is used in this process, so the resulting oil retains a lot its olive-y flavors. Regular olive oil (sometimes marked “pure olive oil”) is a combination of extra virgin olive oil and refined olive oil, which has a more neutral flavor and a higher smoke point. They can be used interchangeably, but you’ll get more flavor with EVOO. On the other hand, you can heat pure olive oil to higher temperatures without burning it, making it a better choice for cooking.