Coil springs are mechanical devices made from coiled wire that are designed to store and release energy. They are commonly used in various applications, such as in vehicles, furniture, and machinery, to absorb shocks and provide support. The coiled shape allows them to compress and expand, making them effective at managing forces and maintaining stability. These springs work based on Hooke's Law, which states that the force exerted by a spring is proportional to its displacement. Coil springs can be found in different forms, including compression springs, tension springs, and torsion springs, each serving specific functions in their respective applications.