Protective agents are substances or organisms that help defend against harmful agents, such as pathogens or toxins. They can be found in various forms, including chemicals, biological materials, or even certain types of cells in the immune system. For example, antibodies are protective agents produced by the body to neutralize viruses and bacteria. In addition to biological protective agents, there are also synthetic options used in various industries. These include antimicrobial coatings that prevent the growth of harmful microorganisms on surfaces. Protective agents play a crucial role in maintaining health and safety in both natural and artificial environments.