Incense, from the Latin form incensum, refers to any substance that is burnt in order to give off perfume. Frankincense and myrrh are the most famous products belonging to incense definition, which also refers to numerous products that can be found outside Arabia. Because of their rarity and their use in upper-class society and/or in religious contexts, these products have represented a great source of income for the human societies involved in the incense trade.
Frankincense is produced by the Boswellia tree belonging to the Burseraceae family. Thirty-one species are known and, among them, Boswellia sacra is the main source of frankincense. [It grows in Somalia, Hadramawt (Yemen), and Dhofar (Zufar, Sultanate of Oman). Boswellia trees are also distributed in the west of India