Sanitizers are substances designed to reduce or eliminate harmful microorganisms on surfaces or skin. They often come in liquid, gel, or foam forms and are commonly used in settings like homes, hospitals, and restaurants. The active ingredients in sanitizers can include alcohol, chlorine, or quaternary ammonium compounds, which help kill germs effectively. Hand sanitizers, a popular type of sanitizer, are especially useful when soap and water are not available. They typically contain at least 60% alcohol to be effective against many types of bacteria and viruses. Using sanitizers can help prevent the spread of illnesses, especially during outbreaks of diseases like COVID-19.