A variety of plants cover the Earth in different shapes, sizes, colors, and scents. Many of these plants contain compounds that typically can’t be seen with the naked eye—they hide within the roots, flowers, seeds, bark, or other areas of the plant. These compounds are known as essential oils. They are highly concentrated, making them extremely potent. Also referred to as volatile aromatic compounds, essential oils give a plant its aroma, protect it from harsh environmental conditions and insects, and even play a part in plant pollination.