A weather vane is a device used to show the direction of the wind. Typically mounted on a rooftop or a tall pole, it consists of a rotating arrow or figure that points into the wind. This helps people understand which way the wind is blowing, which can be useful for various activities, including farming and sailing. Weather vanes are often made of materials like metal or wood and can come in various designs, from simple arrows to decorative shapes like animals or famous landmarks. They have been used for centuries and are a common feature in many regions around the world.