Olive oils possess many of the same properties that wines do.
Olive oils vary from year to year depending on the climate, region, and the type of olives used.
Olive oil comes in three quality grades, and is predominately produced in Spain, Italy, Greece, Tunisia, Turkey, Portugal, Morocco, and France. Extra virgin oils have the strongest flavor of the three different grades and are the most expensive. The next grade is pure oil, which is lighter in flavor and higher in acidity. The lowest quality olive oil is pomace , which is obtained from the final press of the olive pits and skins. Many olive oil refiners also empty their filters into the pomace oil.