What is the main function of bearings？

A bearing is a 'component that helps objects rotate'. As the name suggests, bearings are components that support the "shaft" that rotates in a machine. Machines that use bearings include cars, airplanes, generators, etc. Bearings are also used in household appliances such as refrigerators, vacuum cleaners, air conditioners, etc. In these machines, bearings are responsible for supporting the "shaft" with wheels, gears, turbines, rotors, and other parts, and helping the shaft rotate smoothly. Due to the use of many rotating "shafts" in various machines, bearings have become essential components and are known as the "grain of the mechanical industry".
It has two main functions:
Function 1: Reduce friction and ensure smoother rotation. The "axis" and supporting parts of the rotation will definitely experience friction. Bearings are used between the rotating "shaft" and the rotating support part. Bearings can reduce friction, make rotation smoother, and reduce energy consumption. This is the maximum function of bearings.
Function 2: Protects the rotating support part, keeping the rotating "axis" in the correct position. The rotating "axis" and the rotating support part will bear a significant force. Bearings can prevent damage to the rotating support part due to this force, keeping the rotating "shaft" in the correct position. It is precisely because of these functions of bearings that we can use the machine repeatedly for a long time.