A water purifier is a device used to remove impurities, such as bacteria, viruses, chemicals, and other contaminants, from drinking water. The goal is to provide clean, safe, and potable water for drinking and cooking. There are different types of water purifiers, including activated carbon filters, reverse osmosis (RO) systems, ultraviolet (UV) sterilisers, and ion exchange filters. Some water purifiers also use a combination of these methods to provide a higher level of filtration and purification. Water purifiers can be installed at the point of use, such as under the sink, or at the point of entry, where they filter all the water that enters the home. They are commonly used in homes, offices, and public spaces where access to safe drinking water is limited. Regular maintenance and replacement of filters is necessary to ensure that the water purifier continues to function effectively.