Biological weapons are harmful agents, such as bacteria, viruses, or toxins, used intentionally to cause illness or death in humans, animals, or plants. These weapons can be spread through various means, including air, water, or food, making them particularly dangerous. The use of biological weapons is prohibited under international law, specifically the Biological Weapons Convention. Historically, biological weapons have been employed in warfare and acts of terrorism. Notable examples include the use of anthrax and plague during conflicts. The potential for widespread impact and difficulty in detection makes biological weapons a significant concern for global security and public health.