Water use efficiency is a measure of how effectively water is used in agricultural, industrial, and domestic settings. It refers to the amount of output or benefit gained from a unit of water input. Improving water use efficiency is important for conserving water resources, reducing water waste, and increasing productivity in various sectors. Research in this area focuses on developing technologies, practices, and policies to optimize water use, reduce water consumption, and enhance the sustainability of water resources. This includes studying crop irrigation techniques, water management strategies, water-saving technologies, and water conservation policies.