Bacillus subtilis is a type of bacteria commonly found in soil and the gastrointestinal tract of ruminants and humans. It is a rod-shaped, gram-positive bacterium that can form spores, allowing it to survive in harsh conditions. This bacterium is known for its ability to produce enzymes and antibiotics, making it beneficial in various applications, including agriculture and food production. In addition to its natural habitat, Bacillus subtilis is often used as a probiotic in dietary supplements and animal feed. It helps promote gut health and improve digestion. Researchers also study this bacterium for its potential in biotechnology and medicine due to its unique properties.