Plastic deformation is a process that occurs when a material, like metal or plastic, is subjected to stress beyond its elastic limit. Unlike elastic deformation, where the material returns to its original shape after the stress is removed, plastic deformation results in a permanent change in shape. This means that the material will not go back to its initial form, even when the force is taken away. This phenomenon is crucial in various applications, such as in the manufacturing of automobiles and construction materials. Engineers often rely on plastic deformation to shape materials into desired forms, ensuring they can withstand the forces they will encounter in real-world use.