Agarwood, aloeswood, eaglewood, gharuwood or the Wood of Gods, most commonly referred to as oud or oudh, is a fragrant, dark and resinous wood used in incense, perfume, and small hand carvings. It forms in the heartwood of Aquilaria trees after they become infected with a type of Phaeoacremonium mold, P. parasitica. The tree defensively secretes a resin to combat the fungal infestation. Prior to becoming infected, the heartwood mostly lacks scent, and is relatively light and pale in colouration. However, as the infection advances and the tree produces its fragrant resin as a final option of defense, the heartwood becomes very dense, dark, and saturated with resin. This product is harvested, and most famously referred to in cosmetics under the scent names of oud, oodh or aguru; however, it is also called aloes, agar, as well as gaharu or jinko. With thousands of years of known use, and valued across Muslim, Christian, and Hindu communities, oud is prized in Middle Eastern and South Asian cultures for its distinctive fragrance, utilized in colognes, incense and perfumes.