Every solid material has the tendency of resisting a change in its shape due to its natural character of elasticity. So, when a force is applied to a body there is an initial deformation in that object and some energy is developed inside it. It has been observed that if the force is applied to a limit, then the body comes back to its shape but if the force exceeds that limit then the deformation is permanent. So the Elastic limit is the zone where Hooke’s law is applicable.