Water reuse, also known as water recycling or reclaimed water, is the process of treating wastewater to make it suitable for a specific purpose, such as irrigation, industrial processes, or even drinking. This practice helps to alleviate water shortages and reduce the strain on freshwater sources by conserving water and reducing the amount of wastewater that needs to be discharged into the environment. Water reuse systems can range from simple and decentralized to complex and centralized, with various levels of treatment depending on the intended use of the recycled water. Research in this area focuses on developing and improving water reuse technologies, evaluating the potential risks and benefits of reusing water, and designing sustainable and cost-effective reuse systems.