A wind vane is a simple instrument used to show the direction of the wind. It typically consists of a rotating pointer mounted on a vertical axis, which aligns itself with the wind. The pointer usually has a shape that catches the wind, allowing it to turn freely. Wind vanes are commonly found on rooftops and are often used in weather stations to help meteorologists understand wind patterns. Wind vanes can be made from various materials, including metal and plastic, and are often designed with decorative elements. They are essential tools in fields like meteorology and aviation, where knowing wind direction is crucial for forecasting weather and ensuring safe flight operations.