Micro-engines are tiny engines designed to perform specific tasks at a small scale. They can be found in various applications, including medical devices, robotics, and micro-electromechanical systems (MEMS). These engines often use advanced materials and technologies to achieve high efficiency and precision in their operations. The development of micro-engines has led to innovations in fields like nanotechnology and aerospace engineering. By miniaturizing traditional engine designs, researchers can create more compact and lightweight systems that consume less energy while delivering powerful performance. This makes micro-engines essential for future technological advancements.