Aromatherapy is the use of therapeutic plant essential oils to facilitate emotional and physical wellbeing. Essential oils are powerful compounds which can have a profound effect on physical and emotional health. The chemical make up of individual essential oils is very complex, creating compounds which have a wide range of impacts. Furthermore, when used in combination with each other, essential oils can have a synergistic effect increasing certain properties of the oils. Through study and experience, aromatherapists learn hor to utilize the therapeutic properties of essential oils and how to create synergistic effects.