A spring coil is a type of mechanical device that is made from a flexible wire or strip of metal that is shaped into a helix, or spiral, and mounted around an axis. When a force is applied to the spring, it will compress or stretch, depending on the direction of the force. The spring will then return to its original shape when the force is removed. Springs are commonly used in a variety of applications, such as in mechanical clocks, toys, and automotive suspension systems. They are also used to store energy, absorb shock, and provide tension or support.