Snap rings are small, circular metal components used to secure parts within a mechanical assembly. They fit into a groove on a shaft or inside a bore, preventing movement along the axis. Snap rings come in various sizes and types, including internal snap rings and external snap rings, each designed for specific applications. These rings are commonly found in machinery, automotive components, and household appliances. They are essential for maintaining the position of bearings, gears, and other parts, ensuring that everything functions smoothly and efficiently. Proper installation and selection of snap rings are crucial for reliable performance.