Essential oils are oily extracts with a strong characteristic smell typical for the special plants. They are soluble in organic solvents.
Essential oils are build of different chemical compounds. They are fat-soluble but do not consist fats.
In cosmetic industries essential oils are mostly used as fragrance. They are also important as ingredient in spices to upgrade the taste. Several medicines which are not available on prescription contains essential oils as active agent.
On a large scale produced essential oils e.g. orange peel oils or terpentine oils also find a use as technical solvents.