Disinfectants are chemical agents that eliminate 99.9% of harmful bacteria, viruses, fungi, and spores on surfaces, equipment, and skin. Hospitals rely on hospital-grade formulas like quaternary ammonium compounds (quats), hydrogen peroxide, sodium hypochlorite (bleach), and accelerated hydrogen peroxide for sterilizing countertops, bed rails, medical devices, and floors. Home use includes Lysol, Clorox, and alcohol-based cleaners tackling food prep areas and bathrooms. Fast-acting, broad-spectrum, and EPA-approved, disinfectants prevent infections when used with proper contact times and pre-cleaning.