Biochemical weapons are harmful agents that use biological organisms or toxins to cause illness or death in humans, animals, or plants. These weapons can include bacteria, viruses, or chemical compounds that disrupt normal biological functions. They are often designed to spread quickly and can be difficult to detect, making them a significant threat in warfare and terrorism. The use of biochemical weapons is prohibited under international law, specifically the Biological Weapons Convention and the Chemical Weapons Convention. Despite this, some countries may still develop or stockpile these weapons, raising concerns about global security and the potential for catastrophic consequences.