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, cooling it to condense the water vapor, and then releasing drier air back into the room. This process helps prevent mold growth, dust mites, and other allergens that thrive in humid environments. Dehumidifiers are commonly used in homes, basements, and other areas prone to excess moisture. They come in various sizes and types, including refrigerant and desiccant models, allowing users to choose one that best fits their needs and space.