Shape-memory polymers are special materials that can change their shape in response to external stimuli, such as heat or light. When these polymers are deformed, they can "remember" their original shape and return to it when activated. This unique property makes them useful in various applications, including medical devices and smart textiles. These polymers are designed at the molecular level to have specific configurations that allow them to switch shapes. Researchers are exploring their potential in fields like robotics and aerospace, where adaptable materials can improve functionality and efficiency.