Frankincense, also called olibanum, is a gum resin, an aromatic, viscous substance from the Boswellia tree. The essential oil of frankincense is widely used in oriental and woody fragrances. Frankincense smells spicy, smoky, woody, resinous and balsamic. It often also evokes the association with myrrh, conifers, and pepper. Many people will know and recognize the smell of Frankincense from the church, especially the Catholic Church.