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 components from moving out of place. 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 parts, and household items. They are easy to install and remove, making them a popular choice for engineers and technicians. Proper use of snap rings ensures the reliability and safety of the overall assembly.