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The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. It is one of the most common types of bearings used in various applications such as automotive, machinery, and appliances. The Wikipedia page on ball bearings provides a detailed overview of their construction, working principles, and uses. It also covers the history of ball bearings, different types available, and their advantages and disadvantages. The page includes relevant information about the materials used, manufacturing processes, and the importance of proper maintenance and lubrication for optimal performance. Additionally, it discusses important factors to consider when selecting ball bearings, such as load capacity, speed, and operating conditions. The page also delves into advanced topics like bearing preload, clearance, and the effects of misalignment. Overall, the Wikipedia page on ball bearings offers a comprehensive resource for understanding these ubiquitous mechanical components.