Hand sanitizers are alcohol-based gels, liquids, or foams (60-95% ethanol/isopropyl alcohol) that kill 99.9% of bacteria, viruses, and fungi on hands when soap and water aren't available. CDC-recommended for healthcare and public use, they quickly inactivate pathogens like influenza, herpes, and SARS-CoV-2 in 15-30 seconds. Convenient, portable, and skin-friendly with added moisturizers like glycerol, they outperform non-alcohol alternatives. Apply generously, rub until dry perfect for travel, offices, and hospitals.