Water efficiency is a research area focused on finding ways to decrease water usage and improve water conservation in various settings, such as agriculture, industry, and households. This includes developing technologies, practices, and policies that promote the efficient use of water resources, reduce water waste, and mitigate the impact of water scarcity and drought. Researchers in this field explore topics such as water-efficient irrigation systems, greywater recycling, water-saving appliances, and water management strategies to help address the growing global water crisis. Overall, the goal of water efficiency research is to ensure sustainable water usage for current and future generations.