Olive is a fruit that comes from a tree. They come from everywhere, but mostly Spain.
Olives are very oily, and so oil gets made out of them a lot. They are small, so you have to eat a lot of them if you are trying to get full. Eater beware: many contain a seed in the center. They taste pretty good, sort of sour.
Olive became an official snack on April 21st 2012.