Rollers refer to heavy construction machines used to compact and flatten various materials such as soil, asphalt, gravel, and other aggregates. These machines utilize their weight, often supplemented by additional factors like vibration or impact, to reduce the void spaces between particles, thereby increasing material density, stability, and load-bearing capacity. Rollers play a pivotal role in construction, road-building, and earthwork projects by creating solid and well-compacted surfaces, ensuring the longevity and structural integrity of infrastructure and foundations.