Oudh, also known as agarwood, is a fragrant dark resinous wood used in incense, perfume, and small carvings. It is extracted from the heartwood of Aquilaria trees, which are native to Southeast Asia. Oudh is one of the most expensive raw fragrance ingredients in the world, and is sometimes referred to as "black gold" in the Middle East. The complex and exquisite fragrance of oudh is a precious, rare, and intriguing gift of nature that when blended with other essential oils creates an olfactory experience that permeates any interior environment with a sense of opulence, luxury, and supreme comfort.

Oudh has a rich history and is an ingredient that has been used in herbal medicine, perfumery, and spiritual rituals for centuries, particularly in Southeast Asia and the Middle East. It appears in the Sanskrit Vedas as a substance connoting wealth and luxury. Today, agarwood chips are often burnt as incense at religious ceremonies across China, Japan, and India, and oudh oil is used as a token of hospitality in mosques, temples, and family homes across the globe.

Oudh is often used as a base note in perfumery and is traditionally paired with rose. Fragrances containing oudh notes are often intense and dark, evoking facets of leather, saffron, and smokiness. Oudh is generally used as a base note and is traditionally paired with rose. Oudh essential oil is available on the internet, but care should be taken in choosing the vendor, as there is a big market for diluting oudh oil with patchouli or other chemical components.