A window fan is a practical and energy-efficient cooling device designed to improve airflow and ventilation inside a room. It fits securely into most standard windows and helps circulate fresh air while removing warm, stale air from indoors. Window fans often feature adjustable speed settings, reversible airflow, and expandable side panels for a snug fit. Ideal for bedrooms, kitchens, and living spaces, they provide a cost-effective alternative to air conditioning, especially during mild weather. With quiet operation and easy installation, a window fan helps create a more comfortable and refreshing indoor environment.