An anemometer measures the speed and sometimes the direction of gases, most commonly used in meteorology to forecast weather and understand atmospheric patterns. It is also used in aerospace to monitor wind for safe takeoffs and landings, in construction to design wind-resistant structures, and in agriculture to study wind's effect on crops. Different types of anemometers, such as cup, hot wire, and sonic, exist to suit various needs, from measuring wind speed to analyzing airflow in industrial applications.