A linear bearing is a type of bearing that allows for smooth and precise linear motion between two surfaces. It typically consists of a shaft and a housing, where the shaft moves freely within the housing. Linear bearings are commonly used in machinery and equipment to reduce friction and wear, enabling components to slide or move along a straight path. These bearings can be found in various applications, including 3D printers, CNC machines, and automated systems. They come in different designs, such as ball bearings and roller bearings, each suited for specific load capacities and speed requirements.