A spring is a mechanical device that stores and releases energy. It is typically made of flexible materials like metal and can be compressed or stretched. When a force is applied, the spring changes shape, and when the force is removed, it returns to its original form. Springs are commonly used in various applications, such as in automobiles, furniture, and toys. There are different types of springs, including compression springs, tension springs, and torsion springs. Compression springs are designed to resist being compressed, while tension springs are made to resist being stretched. Torsion springs work by twisting. Each type serves specific purposes in machinery and everyday items.