Reverse osmosis is a water purification technology that uses a semipermeable membrane to remove impurities from water. It works by applying pressure to the water, forcing it through the membrane while leaving contaminants behind. This process is highly effective in removing a wide range of contaminants, including bacteria, viruses, dissolved salts, and other particles. Reverse osmosis is used in a variety of applications, including desalination of seawater, water purification for drinking, and wastewater treatment. It is a popular and efficient method for producing clean and safe drinking water.