A chemical weapon is a type of weapon that uses toxic chemicals to harm or kill people, animals, or plants. These substances can cause severe injuries or death, and they can be dispersed in various ways, such as through gas, liquid, or solid forms. Chemical weapons are often classified into categories based on their effects, including nerve agents, blister agents, and choking agents. The use of chemical weapons is prohibited under international law, specifically the Chemical Weapons Convention. This treaty aims to eliminate chemical weapons and prevent their development, production, and stockpiling. Despite these efforts, some countries and groups have been known to use chemical weapons in conflicts, raising concerns about global security and humanitarian impacts.