Spring force is the force exerted by a compressed or stretched spring when it returns to its original shape. This force is described by Hooke's Law, which states that the force is proportional to the displacement of the spring from its equilibrium position. The formula for spring force is F = -kx, where F is the force, k is the spring constant, and x is the displacement. When a spring is compressed or stretched, it stores potential energy. This energy can be released when the spring returns to its natural length, causing it to push or pull on attached objects. Springs are commonly used in various applications, such as in mechanical devices, toys, and automobiles.