Swivel refers to a type of mechanism that allows an object to rotate or turn freely around a fixed point. Swivels are commonly used in various applications such as chairs, tables, cameras, and fishing rods, among others. The main purpose of a swivel is to enhance mobility and flexibility by enabling the object to move in different directions smoothly. A popular example is the sling swivel, which is a type of swivel used for attaching a sling to a firearm, allowing the user to carry the weapon comfortably and securely. Overall, swivels play a crucial role in enhancing convenience and functionality in a wide range of products and devices.