A dehumidifier is an electrical device designed to reduce and maintain the level of humidity in the air. It works by drawing in moist air, removing the excess moisture, and then releasing drier air back into the environment. This helps prevent mold growth, dust mites, and other allergens that thrive in humid conditions. Dehumidifiers are commonly used in areas like basements, bathrooms, and laundry rooms, where humidity levels can be high. They come in various sizes and types, including refrigerant and desiccant models, making it easy to find one suitable for different spaces and needs.