Rollers are cylindrical tools used in various applications, primarily for painting and applying coatings. They consist of a handle and a roller cover, which is typically made of fabric or foam. The roller cover absorbs paint and allows for even application on surfaces like walls and ceilings. In addition to painting, rollers are also used in sports, such as roller skating and rollerblading, where they refer to the wheels attached to the shoes. These wheels enable smooth movement on surfaces, providing a fun and efficient way to travel or perform tricks.