What are essential oils? Essential oil is a liquid that is generally distilled frequently by steam or water from the leaves, esteems, flowers, bark, roots or other elements of a plant. Essential oils contains the truth essence of the plant it was derived from. Essential oils are highly concentrate and a little goes along way. They aren't the same as fragrance or perfume that contains artificial substances and do not offer therapeutic benefit that essential oils offers. The chemical composition of essential oils can provide valuable psychological and physical therapeutic benefit usually achieve through inhalation and application diluted oil to the skin.