Impurities are unwanted substances that are mixed with a pure material, affecting its quality and properties. For example, in water, impurities can include minerals, bacteria, or chemicals that may alter its taste, safety, or appearance. In metals, impurities can weaken the material, making it less effective for construction or manufacturing. In many industries, removing impurities is crucial for ensuring product quality. Techniques such as filtration, distillation, and purification are commonly used to eliminate these unwanted substances. By reducing impurities, manufacturers can enhance the performance and reliability of their products, leading to better outcomes for consumers.