Filters are devices or materials used to separate unwanted elements from a fluid, such as liquids or gases. They play a crucial role in various applications, including water purification, air quality control, and industrial processes. By trapping particles, contaminants, or impurities, filters help ensure that the output is clean and safe for use. Different types of filters exist, such as mechanical, chemical, and biological filters, each designed for specific purposes. For instance, water filters remove impurities from drinking water, while air filters improve indoor air quality by capturing dust and allergens. Understanding the right filter for a particular application is essential for optimal performance.