Water purifiers are devices designed to remove impurities and contaminants from drinking water, ensuring it is safe for consumption. They use various methods, such as filtration, reverse osmosis, and ultraviolet light, to eliminate harmful substances like bacteria, viruses, and chemicals. These purifiers come in different forms, including countertop models, under-sink systems, and portable units. Many households use water purifiers to improve the taste and quality of their water, making it healthier for daily use. Popular brands often include Brita, Pur, and Aquasana, each offering unique features to cater to different needs.