A rolling pin is a kitchen tool used to flatten and shape dough for baking. Typically made of wood, marble, or plastic, it consists of a cylindrical body with handles on each end. Rolling pins help create even thickness in dough for items like cookies, pie crusts, and pasta. There are different types of rolling pins, including the traditional tapered style and the more modern straight style. Some rolling pins come with adjustable rings to ensure uniform thickness. Using a rolling pin is essential for achieving the desired texture and shape in various baked goods.