Agarwood is a fragrant dark resinous wood formed in the heartwood of aquilaria trees when they become infected with a type of mold. Prior to infection, the heartwood is odourless, relatively light and pale coloured; however, as the infection progresses, the tree produces a dark aromatic resin called agar. Grading, in a scale of 1-10A, is given as a scale for its scent.

In the Chinese culture, Agarwood is known for calming our body and soul, relieve tension, improve the chi, nourish our body's organs, and warming our stomach. On the other hand, the Vietnam culture view Agarwood as wealth wood, and believes its good energy can bring in goodness, luck and fortune. 

沉香是一种芳香的深色树脂木材，在沉香树的心材中感染一种霉菌时形成。感染前，心材无味，相对浅色；然而，随着感染的进展，这棵树会产生一种叫琼脂的深色芳香树脂，被称为沉香。分级以1-10A为尺度，作为其气味的尺度。

在中国文化中，木耳以镇静身心、缓解紧张、改善气、滋养身体器官和温暖胃而闻名。另一方面，越南文化将琼脂树视为财富之木，认为其良好的能量可以带来善良、运气和财富。