Pyrethroids are a class of synthetic chemicals modeled after natural insecticides found in the flowers of the chrysanthemum plant. They are commonly used in agriculture, public health, and household pest control due to their effectiveness in killing a wide range of insects, including mosquitoes, flies, and cockroaches. These compounds work by disrupting the nervous system of insects, leading to paralysis and death. While generally considered safe for humans and pets when used as directed, pyrethroids can be toxic to aquatic life and beneficial insects, making careful application important to minimize environmental impact.