The term 'OYL' is an acronym for OLIVE, which is a small evergreen tree native to the Mediterranean region. It is one of the oldest cultivated trees in the world and has been used for centuries for its oil, fruit, and leaves. The oil is used in cooking, cosmetics, and medicine, while the leaves are used as a garnish or flavoring. The fruit is also edible and can be used in salads or as a garnish.