Chemical agents are substances that can cause a chemical reaction or have a specific effect on living organisms or the environment. They can be found in various forms, such as gases, liquids, or solids, and are often used in industries like agriculture, medicine, and manufacturing. Some common examples include fertilizers, pesticides, and pharmaceuticals. In the context of warfare, chemical agents can refer to toxic compounds designed to harm or incapacitate people. These agents, such as nerve agents or mustard gas, are prohibited under international treaties like the Chemical Weapons Convention. Their use poses significant ethical and safety concerns.