Olives are available throughout the year and a very popular and healthy food. It can’t be eaten right off of the tree as they are bitter in taste. So, they go through some processing to reduce the bitterness. Unripe olives are green and fully ripen olive are black in color. Olives are native of the eastern Mediterranean region and cultivated since ages. They are very popular across the world and the most popular use of olives is olive oil.