Power efficiency is a research area focused on developing technologies and strategies to minimize the amount of energy consumed by electronic devices and systems. This includes improving the energy efficiency of hardware components such as processors, memory, and storage devices, as well as optimizing software algorithms and operating systems to reduce power consumption. Researchers in the field of power efficiency work to design and implement energy-saving techniques such as dynamic voltage and frequency scaling, power gating, and clock gating. They also explore new materials and manufacturing processes to create lower-power consumption devices. Overall, the goal of power efficiency research is to create more energy-efficient technologies that can reduce overall power consumption, extend battery life, and minimize the environmental impact of electronic devices.