Agarwood is reputed to be the most expensive wood in the world. There are many names for the resinous, fragrant heartwood produced primarily by trees in the genus Aquilaria. Most commonly, the resin is known as agarwood, aloeswood, eaglewood, gaharu, agalocha or oud (In Arabic).
Oud has been used to make high quality incense since centuries. The Chinese describe its smell as "a sweet, deep but balanced fragrance" and use it in religious and festive celebrations, and so do Arabian, Indian and Japanese people. Oil extracted from agarwood (oud) is used in niche fragrances available at Sweet Fern.