A roller is a cylindrical tool used in various applications, primarily for applying paint or other coatings to surfaces. It consists of a handle and a rotating cylinder covered with a material that absorbs and distributes the coating evenly. Rollers are commonly used in painting walls, ceilings, and furniture, making the process faster and more efficient than using a brush. In addition to painting, rollers are also used in other fields, such as construction and manufacturing. For example, in construction, rollers can refer to heavy machinery used for compacting soil or asphalt. These machines help create a smooth and stable surface for roads and foundations.