Sandalwood is a class of woods from trees in the genus santalum. The woods are heavy, yellow, and fine-grained, and unlike many other aromatic woods, they retain their fragrance for decades. Sandal wood Oil is extracted from the woods for use. Sandalwood is the second most expensive wood in the world, after African Black wood Both the wood and the oil produce a distinctive fragrance that has been highly valued for centuries. Consequently, species of these slow-growing trees have suffered over-harvesting in the past century