Energy efficiency refers to using less energy to achieve the same outcome. It is essential for achieving sustainability and reducing energy-related costs, greenhouse gas emissions, and other negative environmental impacts. Improving energy efficiency involves adopting technologies, behaviors, and practices that decrease energy waste, such as using energy-efficient appliances, insulating buildings, optimizing industrial processes, and using renewable energy sources. By improving energy efficiency, we can reduce our reliance on fossil fuels and promote a cleaner, more sustainable future. Not only does energy efficiency save money, but it also helps to address climate change by reducing our carbon footprint. Energy efficiency is a key component of addressing our energy challenges, including energy independence, grid reliability, and reducing greenhouse gas emissions.