Oud, Oudh, Aloeswood, Agarwood, Gaharu (different names for the same meaning) is the common name for the tar-like resinous heartwood that forms in the ancient Aquilaria and some Gyrinops species of trees that are native to the dense forests of South East Asia. The heartwood of the tree produces this dark aromatic resin as part of its natural defense mechanism when infected with fungus. This resin can be produced either through natural causes of the wild or through the artificial means of inoculating it with resin-inducing substances.

Agarwood oil essence or the pure Oud Oil is often associated with its ability to bring about calmness in the nervous system, its ability to cultivate focus and alertness when used and, as some say, and the positive effect it gives to one's libido system when applied regularly. Oud Essential Oil is indeed an aromatherapy, is not gender-specific and can be enjoyed by both sexes, though some females may prefer a blended version of the Oud Oil due to the strong potent smell of the pure Oud essence. In the Middle East, men and women burn Oud wood chips to fragrance their houses and also their clothes so that the lasting scent will permeate the whole garment.