Bearings are mechanical components that help reduce friction between moving parts in machines. They allow for smooth rotation or linear movement by supporting loads and guiding motion. Common types of bearings include ball bearings, roller bearings, and plain bearings, each designed for specific applications and load conditions. In various industries, bearings are essential for the efficient operation of machinery, from automobiles to industrial equipment. They are often made from materials like steel or plastic, depending on the required strength and durability. Proper maintenance of bearings can extend their lifespan and improve overall machine performance.