Essential oil is also called aromatic, volatile or essential oil. The essential oils are volatile oils extracted from plants. Essential oils can be extracted from different parts of a plant, such as the blossoms, fruit, seed, leaves, the shell, or the wood (of stem, branches or roots). Contain sometimes different parts of a plant different essential oils. Some types of essential oil are quite expensive. This is because there are sometimes many plants are needed for a small amount of oil to produce. For example, expensive oil, because there is a lot specially for roses the oil cultured roses are needed to produce a little Ethereal oil.