Energy efficiency is a research area focused on improving the utilization of energy resources in order to reduce energy consumption, minimize waste, and lower greenhouse gas emissions. This research area encompasses various technologies, strategies, and policies that aim to enhance the efficiency of energy production, distribution, and consumption in industrial, residential, and commercial sectors. Research in energy efficiency often includes studies on energy-saving materials, energy management systems, smart grids, renewable energy integration, and energy-efficient building design. The goal of energy efficiency research is to promote sustainable energy practices and address the challenges of climate change and energy security.