Shape memory alloys are a class of materials that have the ability to "remember" their original shape and return to it when subjected to certain stimuli, typically temperature or stress. This unique property is due to a reversible phase transformation that occurs in the material. Shape memory alloys are used in a variety of applications, including actuators, sensors, medical devices, aerospace components, and consumer electronics. Research in this area focuses on improving the efficiency, reliability, and functionality of shape memory alloys for various applications, as well as developing new materials and techniques to expand their use in different industries.