Question

What is ball bearing?

Answer 1

Ball bearings are used for rolling elements, such as skateboard wheels or the rotating parts of computer hard drives, or axial devices, such as a sliding drawer

Answer 2

It is a way to reduce the friction, it is a simple mechanical structure containing balls of metals which roll over easily reducing the frictional force. Here is the image which will give u an insight of how they work. Hope this is useful. Mark me as the brainliest.!