Oil diffusers are devices that diffuse essential oils into the air in the form of a fine mist. They work by using heat or ultrasonic vibrations to create the mist and release the fragrance of the essential oils into the air. Essential oils are added to the water in the diffuser and then heated with a candle or other warming source. when the diffuser is turned on, it slowly causes the essential oils to break into small particles and become suspended in the air. Oil diffusers are used for aromatherapy, to improve the ambiance of a room, and to help with relaxation and stress relief. They come in various sizes, shapes, and designs to match the décor of any room.