A round brush is a type of hairbrush characterized by its cylindrical shape and bristles that are arranged in a circular pattern. It is commonly used for styling hair, as it can create volume, curls, or waves depending on the technique applied. Round brushes come in various sizes, allowing users to achieve different styles, from tight curls to loose waves. These brushes are often made with materials like nylon or boar bristles, which help to distribute natural oils and reduce frizz. Many people use a round brush in conjunction with a hairdryer to enhance their styling results, making it a popular tool among both professionals and at-home users.