A roller, also known as a road roller or compaction roller, is a heavy construction machine used to compact soil, gravel, asphalt, and other materials during infrastructure projects. It operates with large cylindrical drums that apply pressure and vibration to increase material density and stability. Rollers are commonly used in road construction, parking lots, airport runways, and foundation preparation. By reducing air gaps and improving surface uniformity, rollers help create a strong and durable base layer. Different types, including single drum and double drum rollers, are designed to suit various compaction requirements and job site conditions.