Fluid film bearings are a type of bearing that support a rotating shaft using a thin layer of lubricant, typically oil. This lubricant creates a film that separates the moving parts, reducing friction and wear. The design allows for smoother operation and can handle high loads and speeds, making them ideal for applications in machinery and engines. These bearings work on the principle of hydrodynamic lubrication, where the motion of the shaft generates pressure in the lubricant film. This pressure keeps the shaft centered and prevents direct contact with the bearing surfaces, enhancing durability and efficiency in systems like turbines and electric motors.