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Ball bearings are a type of rolling-element bearing that use balls to maintain the separation between bearing races, reducing friction and supporting both radial and axial loads.

They are widely used in various mechanical applications—from household appliances and automotive components to industrial machinery—due to their simplicity, efficiency, and ability to operate at high speeds. The spherical shape of the rolling elements minimizes surface contact, resulting in low friction, smooth rotation, and long service life when properly maintained.