Bt toxin is a naturally occurring insecticidal protein produced by the bacterium Bacillus thuringiensis. It is commonly used in agriculture as a biological pesticide to control insect pests that damage crops. Bt toxin works by binding to specific receptors in the gut of insects, leading to their death within a few days of ingestion. Research in the area of Bt toxin focuses on understanding its mode of action, developing new and improved strains of Bt-producing bacteria, and exploring its potential for use in genetically modified crops. Researchers are also investigating the impact of Bt toxin on non-target organisms and the environment, as well as ways to prevent insect resistance to the toxin. Overall, the study of Bt toxin plays a critical role in sustainable agriculture and pest management practices.