"Bactericidal" refers to substances or agents that kill bacteria. These agents can be found in various forms, including antibiotics, disinfectants, and antiseptics. Bactericidal activity is crucial in medical settings to prevent infections and control the spread of harmful bacteria. Common examples of bactericidal agents include penicillin, chlorine bleach, and alcohol. Unlike bacteriostatic agents, which only inhibit bacterial growth, bactericidal agents actively destroy bacteria, making them essential in treating bacterial infections and maintaining hygiene in environments like hospitals and laboratories.