A biological weapon is a type of weapon that uses harmful microorganisms, such as bacteria or viruses, to cause illness or death in humans, animals, or plants. These weapons can be intentionally released to create widespread disease and panic. They are considered a form of biological warfare, which is the use of biological agents to achieve military or political objectives. Biological weapons can be difficult to detect and control, making them particularly dangerous. Some examples of agents that could be used include anthrax, smallpox, and botulinum toxin. The use of biological weapons is prohibited under the Biological Weapons Convention, an international treaty aimed at preventing their development and use.