Bacillus thuringiensis (Bt) is a naturally occurring bacterium found in soil and plants. It produces proteins that are toxic to certain insects, making it a popular biological pesticide. Farmers often use Bt to protect crops from pests without harming beneficial insects or the environment. The bacterium is safe for humans and animals, as its toxins specifically target the digestive systems of certain insects, such as caterpillars and beetles. Bacillus thuringiensis is widely used in organic farming and is available in various formulations, including sprays and granules, to help control pest populations effectively.