An aromatic diffuser is a household appliance that uses water sprays, heat, and essential oils to create a pleasant aroma in the air. They make use of high-frequency vibrations to release beneficial micronized oils into the air. They can also be used as humidifiers or dehumidifiers. The Aromatic Diffuser is a device that releases fragrance or essential oil into the air. Essential oils precipitate over time through water vapor and heat.