It`s the aromatic, volatile liquid that is within many shrubs, flowers, trees, roots, bushes and seeds.
For getting the essential oil, it is usually distilled through steam distillation.
The chemistry of an essential oil is very complex and may consist of hundreds of different and unique chemical compounds.
Moreover, essential oils are highly concentrated and far more potent than dried herbs because of the distillation process that makes them so concentrated.
It requires a large volume of plant material to produce small amounts of a distilled essential oil.
For example, it takes 5,000 pounds of rose petals to produce 1 kio of rose oil.