An aromatherapy diffuser is a device that disperses essential oils into the air, creating a pleasant and calming atmosphere. It works by breaking down the oils into tiny particles, allowing them to be easily inhaled. Many diffusers also add moisture to the air, which can help improve overall air quality. These diffusers come in various styles, including ultrasonic, nebulizing, and heat-based models. Users can choose different essential oils, such as lavender for relaxation or peppermint for energy. Aromatherapy diffusers are popular in homes, spas, and wellness centers for their potential benefits to mood and well-being.