Hand sanitizers are a type of liquid, gel, or foam that are designed to kill germs and bacteria on the hands. They are typically used as a convenient alternative to soap and water when hand washing is not possible, and they are commonly used in settings where hygiene is important, such as hospitals, schools, and food service establishments.Most hand sanitizers contain alcohol as the active ingredient, typically in the form of either ethyl alcohol or isopropyl alcohol. Alcohol is effective at killing many types of bacteria and viruses, and it evaporates quickly, leaving hands feeling clean and dry.