An essential oil is a concentrated hydrophobi liquid containing volatile aroma compounds from plants. Simply put, it is the "oil of" the plant from which it was extracted. The fragrance enhances the body and mind in different ways depending on the botanical essence. Essential oils offer physiological effects. Evidence exists demonstrating the therapeutic potential of essential oils. Eucalyptus and lavender are commonly used in saunas and steam rooms because of their antiviral and antibacterial properties to fight infections and to purify the air.