100% pure, therapeutic grade essential oils should be the only ones in your home. But what are essential oils? They are naturally occurring volatile aromatic compounds distilled from the seeds, roots, flowers, bark and other parts of plants. If you’ve ever enjoyed the smell a rose or crushed some rosemary in your hands, you’ve enjoyed the aromatic qualities of essential oils. What does volatile aromatic compound mean? Simply that they change from a liquid to a gas very quickly.