Deformable materials are substances that can change shape or size when subjected to external forces. These materials can stretch, compress, bend, or twist without breaking, making them useful in various applications. Common examples include rubber, clay, and certain metals, which can return to their original shape after the force is removed. In engineering and design, understanding deformable materials is crucial for creating products that can withstand stress and strain. For instance, automotive parts often use deformable materials to absorb impact during collisions, enhancing safety. Additionally, biomaterials used in medical devices are designed to mimic the flexibility of human tissues.