A road roller is a compactor-type engineering vehicle used to compact soil, gravel, concrete, or asphalt in the construction of roads and foundations. Similar rollers are used also at landfills or in agriculture.

A compactor is a machine or mechanism used to reduce the size of material such as waste material or bio mass through compaction. A trash compactor is often used by business and public places like hospitals to reduce the volume of trash they produce. A baler-wrapper compactor is often used for making compact and wrapped bales in order to improve logistics.