Compaction is the process of reducing the volume of a material, often by applying pressure. In construction, for example, soil compaction is crucial for creating a stable foundation for buildings. When soil is compacted, air pockets are removed, making it denser and less likely to shift or settle over time. This helps ensure that structures remain safe and durable. In the context of waste management, compaction refers to compressing waste materials to save space in landfills. By using machines like compactors, waste can be packed tightly, allowing more trash to fit into a smaller area. This not only optimizes landfill space but also reduces the frequency of waste collection trips.